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  • 1. Choudhury, B. Dev
    et al.
    Sahoo, Pankaj K.
    Sanatinia, R.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Anand, S.
    Swillo, M.
    Surface second harmonic generation from silicon pillar arrays with strong geometrical dependence2015Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 40, nr 9, s. 2072-2075Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present experimental demonstration and analysis of enhanced surface second harmonic generation (SHG) from hexagonal arrays of silicon pillars. Three sets of Si pillar samples with truncated cone-shaped pillar arrays having periods of 500, 1000, and 2000 nm, and corresponding average diameters of 200, 585 and 1550 nm, respectively, are fabricated by colloidal lithography and plasma dry etching. We have observed strong dependence of SHG intensity on the pillar geometry. Pillar arrays with a 1000 nm period and a 585 nm average diameter give more than a one order of magnitude higher SHG signal compared to the other two samples. We theoretically verified the dependence of SHG intensity on pillar geometry by finite difference time domain simulations in terms of the surface normal E-field component. The enhanced surface SHG light can be useful for nonlinear silicon photonics, surface/interface characterization, and optical biosensing.

  • 2.
    El Hassan, Ashraf
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Kunst, Flore K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moritz, Alexander
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bergholtz, Emil J.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bourennane, Mohamed
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Corner states of light in photonic waveguides2019Ingår i: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 13, nr 10, s. 697-700Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The recently established paradigm of higher-order topological states of matter has shown that not only edge and surface states(1,2) but also states localized to corners, can have robust and exotic properties(3-9). Here we report on the experimental realization of novel corner states made out of visible light in three-dimensional photonic structures inscribed in glass samples using femtosecond laser technology(10,11). By creating and analysing waveguide arrays, which form two-dimensional breathing kagome lattices in various sample geometries, we establish this as a platform for corner states exhibiting a remarkable degree of flexibility and control. In each sample geometry we measure eigenmodes that are localized at the corners in a finite frequency range, in complete analogy with a theoretical model of the breathing kagome(7-9,12-14). Here, measurements reveal that light can be 'fractionalized,' corresponding to simultaneous localization to each corner of a triangular sample, even in the presence of defects.

  • 3.
    Gatchell, Michael
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schmidt, Henning T.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Alexander, John D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Björkhage, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Blom, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Brännholm, Lars
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bäckström, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Chen, Tao
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Geppert, Wolf
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Halldén, Per
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hanstorp, Dag
    Hellberg, Fredrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källberg, Anders
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Larsson, Mats
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leontein, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Liljeby, Leif
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Löfgren, Patrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Mannervik, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Paal, Andras
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Reinhed, Peter
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rensfelt, Karl-Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rosén, Stefan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Seitz, Fabian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Simonsson, Ansgar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Stockett, Mark H.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Thomas, Richard D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Zettergren, Henning
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Cederquist, Henrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    First results from the Double ElectroStatic Ion-Ring ExpEriment, DESIREE2014Ingår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 488, s. 092003-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We have stored the first beams in one of the rings of the double electrostatic ion-storage ring, DESIREE at cryogenic and at room temperature conditions. At cryogenic operations the following parameters are found. Temperature; T= 13K, pressure; p <10(-13) mbar, initial number of stored ions; N > 10(7) and storage lifetime of a C-2(-) beam; tau = 450 S.

  • 4.
    Gatchell, Michael
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schmidt, Henning T.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Thomas, Richard D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rosén, Stefan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Reinhed, Peter
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Löfgren, Patrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Brännholm, Lars
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Blom, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Björkhage, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bäckström, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Alexander, John D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leontein, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hanstorp, D.
    Zettergren, Henning
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Liljeby, Leif
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källberg, Anders
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Simonsson, Ansgar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hellberg, Fredrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Mannervik, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Larsson, Mats
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Geppert, Wolf D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rensfelt, Karl-Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Danared, Håkan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. European Spallation Source, Sweden.
    Paál, Andras
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Masuda, Masaharu
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Halldén, Per
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Stockett, Mark H.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Chen, Tao
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källersjö, Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Weimer, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hansen, K.
    Hartman, H.
    Cederquist, Henrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Commissioning of the DESIREE storage rings - a new facility for cold ion-ion collisions2014Ingår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 488, s. 012040-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We report on the ongoing commissioning of the Double ElectroStatic Ion Ring ExpEriment, DESIREE, at Stockholm University. Beams of atomic carbon anions (C-) and smaller carbon anion molecules (C-2(-), C-3(-), C-4(-) etc.) have been produced in a sputter ion source, accelerated to 10 keV or 20 keV, and stored successfully in the two electrostatic rings. The rings are enclosed in a common vacuum chamber cooled to below 13 Kelvin. The DESIREE facility allows for studies of internally relaxed single isolated atomic, molecular and cluster ions and for collision experiments between cat-and anions down to very low center-of-mass collision energies (meV scale). The total thermal load of the vacuum chamber at this temperature is measured to be 32 W. The decay rates of stored ion beams have two components: a non-exponential component caused by the space charge of the beam itself which dominates at early times and an exponential term from the neutralization of the beam in collisions with residual gas at later times. The residual gas limited storage lifetime of carbon anions in the symmetric ring is over seven minutes while the 1/e lifetime in the asymmetric ring is measured to be about 30 seconds. Although we aim to improve the storage in the second ring, the number of stored ions are now sufficient for many merged beams experiments with positive and negative ions requiring milliseconds to seconds ion storage.

  • 5.
    Mohamed El Hassan, Ashraf
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bourennane, Mohamed
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Tunable integrated devices for quantum optics experiments, based on fs-laser writing of optical waveguides in glassManuskript (preprint) (Övrigt vetenskapligt)
  • 6.
    Mohamed El Hassan, Ashraf
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Kunst, Flore
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Moritz, Alexander
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bergholtz, Emil
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bourennane, Mohamed
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Corner state of light in photonic waveguides2018Ingår i: Artikel i tidskrift (Refereegranskat)
  • 7.
    Mohamed, T.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum, Manne Siegbahn-laboratoriet.
    Fogle, M.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Justiniano, E.
    Madzunkov, S.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schuch, Reinhold
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Effects of polarization on laser-induced electron-ion recombination2011Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 83, nr 3, s. 032702-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The polarization dependence of laser-induced radiative recombination (LIR) to D(+) ions was investigated in the electron cooler of the CRYRING storage ring. The LIR gain as a function of wavelength into n = 3 principal quantum states of deuterium was measured at laser beam polarization angles of 0 degrees and 90 degrees with respect to the direction of the motional electric field in the interaction region. For the case of the polarization vector parallel to the external field, there is a double-peak structure in the gain curve that indicates a polarization effect in the LIR process. The two polarization directions also reveal a different width for the respective gain curves, giving additional evidence for the polarization effect, clearly seen by the behavior of a defined polarization parameter. The obtained polarization effect indicates a high sensitivity in recombination processes to external fields.

  • 8.
    Mohamed, Tarek
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Beni Suef University, Egypt.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schuch, Reinhold
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    A seeded dye laser cavity for intracavity experiments2015Ingår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 25, nr 9, artikel-id 095801Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A seeded dye laser cavity, synchronously pumped by the 2nd harmonic of the Nd:YAG laser has been designed and experimentally tested. The used seed signal was the well defined narrow linewidth output laser signal (Delta lambda = 0.013 nm) from the excimer-dye laser system. Energy considerations showed that the intracavity laser energy, that can be used for an experimental section inside the cavity, can reach an efficiency of 20% of the pumping energy. The wavelength and linewidth are fully controlled by the wavelength and linewidth of the seeding laser.

  • 9.
    Orban, Istvan
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Altun, Zikri
    Department of Physics, Marmara University, 81040 Istanbul, Turkey.
    Källberg, Anders
    Stockholms universitet, Naturvetenskapliga fakulteten, Manne Siegbahn-laboratoriet.
    Simonsson, Ansgar
    Stockholms universitet, Naturvetenskapliga fakulteten, Manne Siegbahn-laboratoriet.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Manne Siegbahn-laboratoriet.
    Paál, Andreas
    Stockholms universitet, Naturvetenskapliga fakulteten, Manne Siegbahn-laboratoriet.
    Blom, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Manne Siegbahn-laboratoriet.
    Löfgren, Patrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Manne Siegbahn-laboratoriet.
    Trotsenko, Sergiy
    GSI Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany.
    Böhm, Sebastian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schuch, Reinhold
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Experimental dielectronic recombination rate coefficientsfor Na-like S VI and Na-like Ar VIII2009Ingår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 498, s. 909-914Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Aims. Absolute recombination rate coefficients for two astrophysically relevant Na-like ions are presented.Methods. Recombination rate coefficients of S vi and Ar viii are determined from merged-beam type experiments at the CRYRINGelectron cooler. Calculated rate coefficients are used to account for recombination into states that are field-ionized and therefore notdetected in the experiment.Results. Dielectronic recombination rate coefficients were obtained over an energy range covering Δ n = 0 core excitations. ForNa-like Ar a measurement was also performed over the Δn = 1 type of resonances. In the low-energy part of the Ar viii spectrum,enhancements of more than one order of magnitude are observed as compared to the calculated radiative recombination. The plasmarecombination rate coefficients of the two Na-like ions are compared with calculated results from the literature. In the 103−104 Krange, large discrepancies are observed between calculated plasma rate coefficients and our data. At higher temperatures, above105 K, in the case of both ions our data is 30% higher than two calculated plasma rate coefficients, other data from the literaturehaving even lower values.Conclusions. Discrepancies below 104 K show that at such temperatures even state-of-the-art calculations yield plasma rate coefficientsthat have large uncertainties. The main reason for these uncertainties are the contributions from low-energy resonances, whichare difficult to calculate accurately.

  • 10.
    Schmidt, Henning T.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Thomas, Richard D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Gatchell, Michael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rosén, Stefan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Reinhed, Peter
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Löfgren, Patrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Brännholm, Lars
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Blom, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Björkhage, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bäckström, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Alexander, John D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leontein, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hanstorp, D.
    Zettergren, Henning
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Liljeby, Leif
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källberg, Anders
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Simonsson, Ansgar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hellberg, Fredrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Mannervik, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Larsson, Mats
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Geppert, Wolf D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rensfelt, Karl-Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Danared, Håkan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Paal, A.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Masuda, Masaharu
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hallden, Per
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Stockett, Mark H.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Chen, Tao
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källersjö, Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Weimer, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hansen, K.
    Hartman, H.
    Cederquist, Henrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    First storage of ion beams in the Double Electrostatic Ion-Ring Experiment: DESIREE2013Ingår i: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 84, nr 5, s. 055115-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We report on the first storage of ion beams in the Double ElectroStatic Ion Ring ExpEriment, DESIREE, at Stockholm University. We have produced beams of atomic carbon anions and small carbon anion molecules (C-n(-), n = 1, 2, 3, 4) in a sputter ion source. The ion beams were accelerated to 10 keV kinetic energy and stored in an electrostatic ion storage ring enclosed in a vacuum chamber at 13 K. For 10 keV C-2(-) molecular anions we measure the residual-gas limited beam storage lifetime to be 448 s +/- 18 s with two independent detector systems. Using the measured storage lifetimes we estimate that the residual gas pressure is in the 10(-14) mbar range. When high current ion beams are injected, the number of stored particles does not follow a single exponential decay law as would be expected for stored particles lost solely due to electron detachment in collision with the residual-gas. Instead, we observe a faster initial decay rate, which we ascribe to the effect of the space charge of the ion beam on the storage capacity.

  • 11.
    Thomas, Richard D.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schmidt, Henning T.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Björkhage, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Blom, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Brännholm, Lars
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bäckstrom, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Danared, Håkan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Das, Susanta
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Haag, Nicole
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Halldén, Per
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hellberg, Fredrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Holm, Anne I. S.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Johansson, H. A. B.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källberg, Anders
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källersjö, Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Larsson, Mats
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leontein, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Liljeby, Leif
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Löfgren, Patrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Malm, Bo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Mannervik, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Masuda, Masaharu
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Misra, Deepankar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Orban, A.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Paál, Andras
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Reinhed, Peter
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rensfelt, Karl-Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rosén, Stefan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schmidt, K.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Seitz, Fabian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Simonsson, Ansgar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Weimer, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Zettergren, Henning
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Cederquist, Henrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    The double electrostatic ion ring experiment: A unique cryogenic electrostatic storage ring for merged ion-beams studies2011Ingår i: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 82, nr 6, s. 065112-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We describe the design of a novel type of storage device currently under construction at Stockholm University, Sweden, using purely electrostatic focussing and deflection elements, in which ion beams of opposite charges are confined under extreme high vacuum cryogenic conditions in separate rings and merged over a common straight section. The construction of this double electrostatic ion ring experiment uniquely allows for studies of interactions between cations and anions at low and well-defined internal temperatures and centre-of-mass collision energies down to about 10 K and 10 meV, respectively. Position sensitive multi-hit detector systems have been extensively tested and proven to work in cryogenic environments and these will be used to measure correlations between reaction products in, for example, electron-transfer processes. The technical advantages of using purely electrostatic ion storage devices over magnetic ones are many, but the most relevant are: electrostatic elements which are more compact and easier to construct; remanent fields, hysteresis, and eddy-currents, which are of concern in magnetic devices, are no longer relevant; and electrical fields required to control the orbit of the ions are not only much easier to create and control than the corresponding magnetic fields, they also set no upper mass limit on the ions that can be stored. These technical differences are a boon to new areas of fundamental experimental research, not only in atomic and molecular physics but also in the boundaries of these fields with chemistry and biology. For examples, studies of interactions with internally cold molecular ions will be particular useful for applications in astrophysics, while studies of solvated ionic clusters will be of relevance to aeronomy and biology.

  • 12.
    Thomas, Richard D.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schmidt, Henning T.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Gatchell, Michael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rosén, Sara
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Reinhed, Peter
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Löfgren, Patrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Brännholm, Lars
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Blom, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Björkhage, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bäckström, Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Alexander, John D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Leontein, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hanstorp, D.
    Zettergren, Henning
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Kaminska, Magdalena
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Nascimento, Rodrigo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Liljeby, Leif
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källberg, Anders
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Simonsson, Ansgar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hellberg, Fredrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Mannervik, Sven
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Larsson, Mats
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Geppert, Wolf D.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Rensfelt, Karl-Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Paál, Andras
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Masuda, Masaharu
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Halldén, Per
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Stockett, Mark H.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Chen, Tao
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Källersjö, Gunnar
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Weimer, Jan
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hansen, K.
    Hartman, H.
    Cederquist, Henrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    DESIREE: Physics with cold stored ion beams2015Ingår i: DR2013: Ninth international conference on dissociative recombination: theory, experiment, and applications, 2015, Vol. 84, artikel-id 01004Konferensbidrag (Refereegranskat)
    Abstract [en]

    Here we will briefly describe the commissioning of the Double ElectroStatic Ion Ring ExpEriment (DESIREE) facility at Stockholm University, Sweden. This device uses purely electrostatic focussing and deflection elements and allows ion beams of opposite charge to be confined under extreme high vacuum and cryogenic conditions in separate rings and then merged over a common straight section. This apparatus allows for studies of interactions between cations and anions at very low and well-defined centre-of-mass energies (down to a few meV) and at very low internal temperatures (down to a few K).

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