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Radiative lifetimes of bound excited states in anions: Measurements on long-lived metastable states in atomic anions
Stockholm University, Faculty of Science, Department of Physics.
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents and discusses the results of measurements of the intrinsic lifetimes of bound excited anionic states. The results are valuable for evaluation of different theoretical models and computation methods and are compared to calculations when available. The measurements were carried out at the DESIREE facility located in the AlbaNova University Center in Stockholm. The storage ring used is cryogenically cooled and has a very low residual gas density. Both of these features are needed for the storage of some bound excited anionic states, as blackbody radiation would otherwise photodetach the state. Residual gas density is the main limiting factor for storage lifetime in the presented measurements. The majority of the work has been in the development and refinement of the laser probing technique utilized for the measurements, which had to be adapted for each anion to account for the different time-domains and wavelengths required.

The published results was a radiative lifetime of 503±54 seconds for the 3p5 2P1/2 state in sulfur, 15.1±0.4 seconds for the 4s2 2D3/2 state in nickel and 2.54±0.10 seconds for the 5d10 6s 2S1/2 state in platinum. The radiative lifetime of the 5d9 6s2 2D3/2 state in platinum could only be estimated to a range of 50 ms to 200 ms.

Place, publisher, year, edition, pages
Stockholm University, 2018. , p. 64
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-162168OAI: oai:DiVA.org:su-162168DiVA, id: diva2:1263270
Available from: 2019-06-11 Created: 2018-11-14 Last updated: 2019-06-11Bibliographically approved
List of papers
1. Storing keV negative ions for an hour: The lifetime of the metastable 2P1/2 level in 32S−
Open this publication in new window or tab >>Storing keV negative ions for an hour: The lifetime of the metastable 2P1/2 level in 32S−
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2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 14, article id 143003Article in journal (Refereed) Published
Abstract [en]

We use a novel electrostatic ion storage ring to measure the radiative lifetime of the upper level in the 3p 5  P 2  o 1/2 →3p 5  P 2  o 3/2   spontaneous radiative decay in S −  32   to be 503±54  sec . This is by orders of magnitude the longest lifetime ever measured in a negatively charged ion. Cryogenic cooling of the storage ring gives a residual-gas pressure of a few times 10 −14   mbar at 13 K and storage of 10 keV sulfur anions for more than an hour. Our experimental results differ by 1.3σ  from the only available theoretical prediction.

National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-114302 (URN)10.1103/PhysRevLett.114.143003 (DOI)000352192200009 ()
Funder
Swedish Research Council, 821-2013-1642Swedish Research Council, 621-2012-3662Swedish Research Council, 621-2011-4047Swedish Research Council, 621-2013-4084
Available from: 2015-02-26 Created: 2015-02-26 Last updated: 2018-11-14Bibliographically approved
2. Lifetime of the bound excited level in Ni-
Open this publication in new window or tab >>Lifetime of the bound excited level in Ni-
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2016 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 93, no 1, article id 012512Article in journal (Refereed) Published
Abstract [en]

The intrinsic lifetime of the upper level in the bound-bound 3d(9) 4s(2) D-2(3/2) -> 3d(9) 4s(2) D-2(5/2) radiative transition in Ni- was measured to be 15.1 +/- 0.4 s. The experiment was performed at cryogenic temperatures in one of the ion-beam storage rings of the Double ElectroStatic Ion Ring ExpEriment facility at Stockholm University. The storage lifetime of the Ni- ion beam was measured to be close to 5 min at a ring temperature of 13 K.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-126895 (URN)10.1103/PhysRevA.93.012512 (DOI)000368473600008 ()
Available from: 2016-02-19 Created: 2016-02-16 Last updated: 2018-11-14Bibliographically approved
3. Radiative lifetimes of the bound excited states of Pt-
Open this publication in new window or tab >>Radiative lifetimes of the bound excited states of Pt-
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2016 (English)In: Physical Review A, ISSN 2469-9926, Vol. 94, no 3, article id 032501Article in journal (Refereed) Published
Abstract [en]

The intrinsic radiative lifetimes of the 5d(10)6s(2)S(1/2) and 5d(9)6s(2) D-2(3/2) bound excited states in the platinum anion Pt- have been studied at cryogenic temperatures at the Double ElectroStatic Ion Ring Experiment (DESIREE) facility at Stockholm University. The intrinsic lifetime of the higher-lying 5d(10)6s S-2(1/2) state was measured to be 2.54 +/- 0.10 s, while only a lifetime in the range of 50-200 ms could be estimated for the 5d(9)6s(2) D-2(3/2) fine-structure level. The storage lifetime of the Pt- ion beam was measured to be a little over 15 min at a ring temperature of 13 K. The present study reports the lifetime of an atomic negative ion in an excited bound state with an electron configuration different from that of the ground state.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-135209 (URN)10.1103/PhysRevA.94.032501 (DOI)000382717100010 ()
Available from: 2016-11-15 Created: 2016-11-01 Last updated: 2018-11-14Bibliographically approved

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