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High-precision Mass Measurements of Hydrogen-Like 24Mg11+ and 26Mg11+ ions in a Pening Trap
Stockholm University, Faculty of Science, The Manne Siegbahn Laboratory .
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2002 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 22, no 1, 41-45 p.Article in journal (Refereed) Accepted
Abstract [en]

For the determination of the bound-electron g factor in hydrogen-like heavy ions the mass of the ion is needed at a relative uncertainty of at least 1 ppb. With the SMILETRAP Penning trap mass spectrometer at the Manne Siegbahn Laboratory in Stockholm several mass measurements of ions with even-even nuclei at this level of precision have been performed so far, exploiting the fact that the mass precision increases linearly with the ion charge. Measurements of masses of the hydrogen-like ions of the two Mg-isotopes 24Mg and 26Mg are reported. The masses of the hydrogen-like ions are 23.979011054(14) u and 25.976562354(34) u, corresponding to the atomic masses 23.985041690(14) u and 25.982592986(34) u, respectively. The possibility to use these two isotopes for the first observation of an isotope effect in the bound-electron g factor in hydrogen-like heavy ions is discussed.

Place, publisher, year, edition, pages
2002. Vol. 22, no 1, 41-45 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-23962DOI: 10.1140/epjd/e2002-00216-xOAI: oai:DiVA.org:su-23962DiVA: diva2:196115
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30 Last updated: 2010-08-11Bibliographically approved
In thesis
1. Precision Improvements of Penning Trap Mass Measurements Using Highly Charged Ions: Applications to solving current problems in fundamental physics
Open this publication in new window or tab >>Precision Improvements of Penning Trap Mass Measurements Using Highly Charged Ions: Applications to solving current problems in fundamental physics
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In my thesis I describe the improvements of the Penning trap mass spectrometer SMILETRAP. The objective of these improvements have been to increase the reliability and the accuracy with which an atomic mass can be measured using highly charged ions. The improvements have been achieved by stabilizing both the electric and magnetic fields of the trap and by improving the technical performance of the trap system. As a result it has been possible to measure accurately the mass of several atoms ranging from hydrogen to mercury using charge states from 1+ to 52+. It was only possible to use the highest charge states after applying a successful cooling of these ions with Helium during the charge breeding.

The technical improvements made a number of interesting accurate mass measurements possible. The measurements of the 3H, 3He, and 4He masses showed that the previously values were wrong. The mass difference between 3H and 3He which is the Q-value of the tritium beta decay has been determined to 18.588(3) keV. The Q-value of the double β-decay of 76Ge was measured at an accuracy of 50 eV. This value is indispensable for the evaluation the Heidelberg-Moscow experiment which aims at finding a possible neutrino-less decay which if present would be a violation of the standard model. The mass ratio of mCs/mp is used to determine the fine structure constant independent of QED calculations. The two decades old anomaly in the mass values of Hg was solved by the mass determination of 198Hg and 204Hg. The mass of 24Mg was measured at an uncertatinty of 0.6 ppb and will be used in the determination of the g-factor of a bound electron in a hydrogen like ions.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2002. 61 p.
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-616 (URN)91-7265-510-0 (ISBN)
Public defence
2002-09-20, sal FB53, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
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Available from: 2002-08-30 Created: 2002-08-30 Last updated: 2017-12-01Bibliographically approved

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Björkhage, MikaelNagy, SzilardSchuch, Reinhold
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