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High-precision mass measurements for fundamental applications using highly-charged ions with SMILETRAP
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Manne Siegbahn-laboratoriet.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Visa övriga samt affilieringar
2007 (Engelska)Ingår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 58, s. 109-112Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The Penning trap mass spectrometer SMILETRAP takes advantage of highly-charged ions for high-accuracy mass measurements. In this paper recent mass measurements on Li and Ca ions are presented and their impact on fundamental applications discussed, especially the need for accurate mass values of hydrogen-like and lithium-like ions in the evaluation of the electron g-factor measurements in highly-charged ions is emphasized. Such experiments aim to test bound state quantum electrodynamics. Here the ionic mass is a key ingredient, which can be the limiting factor for the final precision.

Ort, förlag, år, upplaga, sidor
2007. Vol. 58, s. 109-112
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
URN: urn:nbn:se:su:diva-11017DOI: 10.1088/1742-6596/58/1/018OAI: oai:DiVA.org:su-11017DiVA, id: diva2:177536
Tillgänglig från: 2008-01-10 Skapad: 2008-01-10 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
Ingår i avhandling
1. SMILETRAP I / II: Precision Improvements in Penning-Trap Mass-Spectrometry
Öppna denna publikation i ny flik eller fönster >>SMILETRAP I / II: Precision Improvements in Penning-Trap Mass-Spectrometry
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis describes the final precision mass measurements with SMILETRAP I, where a relative precision of < 1 ppb (10-9) was reached routinely, and the development of SMILETRAP II, aiming for measurements with < 0.1 ppb relative precision. The emphasis of the thesis is on the implementation of new techniques for achieving this precision improvement with SMILETRAP II. The Ramsey multiple-pulse excitation technique was tested at SMILETRAP I, and a reduction of the statistical uncertainty by factor three could by verified. The technique was applied in the last measurement with SMILETRAP I on H2+ and D+ ions. From these measurements the proton mass was deduced with a relative error of 0.18 ppb. It was found that temperature dependent magnetic field oscillations limited us from reducing the uncertainties further. A technical achievement of reducing the peak to peak temperature oscillation in the trapping region of SMILETRAP II by a factor four is presented, which should give an extended observation time and likewise improved precision. The new SMILETRAP II super-conducting magnet, with a slightly stronger field of 5.8 T compared with the previous of 4.7 T, was installed and adjusted.  A careful field alignment and reduction of inhomogeneities was done for minimizing the disturbances of the cyclotron frequency for improved precision. In that attempt, the localization and control of the trapped ion motion is also important. Thus a new cooling trap was set up. In the spring of 2009 coherent axial motion of a confined ion cloud was discovered in the cooling trap. By observation of the axial oscillations we can see the effects of evaporative cooling in the reduction of the axial energy distribution. Storing the ions up to 1 s in the cooling trap reduces the energy distribution by a factor of five. Other remarkable results of the ion oscillations are also reported.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physics, Stockholm University, 2009. s. 78
Nyckelord
Penning trap, Mass spectrometers, Instrumentation and methods for time-of-flight (TOF) spectroscopy, Highly charged ions
Nationell ämneskategori
Atom- och molekylfysik och optik
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:su:diva-29399 (URN)978-91-7155-931-9 (ISBN)
Disputation
2009-09-25, sal FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: In progress. Paper 3: Submitted.Tillgänglig från: 2009-09-03 Skapad: 2009-08-26 Senast uppdaterad: 2010-01-13Bibliografiskt granskad

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Av författaren/redaktören
Nagy, SzSuhonen, MSchuch, R
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FysikumManne Siegbahn-laboratoriet
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Journal of Physics, Conference Series
Atom- och molekylfysik och optik

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