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Precision mass measurements of 40Ca17+ and 40Ca19+ ions in a Penning trap
Stockholm University, Faculty of Science, Department of Physics. (atom)
Stockholm University, Faculty of Science, Department of Physics. (atom)
Stockholm University, Faculty of Science, Department of Physics. (atom)
Stockholm University, Faculty of Science, Department of Physics. (atom)
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2006 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 39, no 1, 1-4 p.Article in journal (Refereed) Published
Abstract [en]

High-precision mass measurements on lithium-like and hydrogen-like 40Ca-ions are reported. The obtained mass of the hydrogen-like and lithium-like ion is 39.952181819(29) u and 39.953272223(24) u, respectively. The corresponding mass of the 40Ca atom is 39.962590858(22) u. This new value has a precision ten times higher than the literature value.

Place, publisher, year, edition, pages
2006. Vol. 39, no 1, 1-4 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-12585DOI: 10.1140/epjd/e2006-00064-8OAI: oai:DiVA.org:su-12585DiVA: diva2:179105
Available from: 2008-01-15 Created: 2008-01-15 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Precision mass measurements: Final limit of SMILETRAP I and the developments of SMILETRAP II
Open this publication in new window or tab >>Precision mass measurements: Final limit of SMILETRAP I and the developments of SMILETRAP II
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The subject of this thesis is high-precision mass-measurements performed with Penning trap mass spectrometers (PTMS). In particular it describes the SMILETRAP I PTMS and the final results obtained with it, the masses of 40Ca and that of the proton. The mass of 40Ca is an indispensible input in the evaluation of measurements of the bound electron g-factor, used to test quantum electrodynamical calculations in strong fields. The value obtained agrees with available literature values but has a ten times higher precision.

The measurement of the proton mass, considered a fundamental physical constant, was performed with the aim of validating other Penning trap results and to test the limit of SMILETRAP I. It was also anticipated that a measurement at a relative precision close to 10-10 would give insight in how to treat certain systematic uncertainties. The result is a value of the proton mass in agreement with earlier measurements and with an unprecedented precision of 1.8×10-10.

Vital for the achieved precision of the proton mass measurement was the use of the Ramsey excitation technique. This technique, how it was implemented at SMILETRAP I and the benefits from it is discussed in the thesis and in one of the included papers.

The second part of the thesis describes the improved SMILETRAP II setup at the S-EBIT laboratory, AlbaNova. All major changes and upgrades compared to SMILETRAP I are discussed. This includes, apart from the Ramsey excitation technique, higher ionic charge states, improved temperature stabilization, longer run times, different reference ions, stronger and more stable magnetic field and a more efficient ion detection. Altogether these changes should reduce the uncertainty in future mass determinations by an order of magnitude, possibly down to 10-11.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2011. 64 p.
Keyword
SMILETRAP, Precision mass spectrometry, Penning trap, Atomic mass, Highly charged ions, Low energy ion storage, Time of flight ion cyclotron resonance, High frequency, Proton mass, QED, g-factor
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-56777 (URN)978-91-7447-303-2 (ISBN)
Public defence
2011-05-26, sal FB53, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 9: Accepted.Available from: 2011-05-04 Created: 2011-04-27 Last updated: 2011-05-13Bibliographically approved
2. New atomic masses related to fundamental physics measured with SMILETRAP
Open this publication in new window or tab >>New atomic masses related to fundamental physics measured with SMILETRAP
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes the recent improvements of the SMILETRAP Penning trap mass spectrometer and a number of interesting high precision mass measurements, which have been performed using the improved apparatus, and are relevant in todays fundamental physics problems. The mass of the hydrogen-like 24,26Mg ions as well as the masses of the hydrogen- and lithium-like 40Ca ions are presented in this work that are indispensable input values when evaluating g-factor measurements of the bound electron. In both cases the uncertainty in the masses was improved by one order of magnitude compared to the literature values known so far.

The mass of 7Li has been measured and a new mass value has been obtained with an unprecedented relative uncertainty of 6.3x10-10. A large deviation of 1.1 μu (160ppb) compared to the literature value has been observed. In order to find the reason of this large deviation and to look for possible systematics we have measured the mass of 4He and 6Li and concluded that the 6Li(n,γ)7Li reaction Q-value used in the literature when calculating the 7Li mass is wrong by about 1 keV.

The mass difference between 3He and 3H (Δ m (3H -3He)) is the Q-value of the tritium β-decay. An accurate knowledge of the tritium Q-value is of importance in the search for a finite rest mass of the electron neutrino.

By adding a measurement of the mass of 3He1+ to previous mass measurement of 3H1+ and 3He2+ we have improved our previous Q-value by a factor of 2. At the moment our Q-value is the most accurate and more importantly it is based on the correct atomic mass values.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2005. 51 p.
Keyword
Penning Trap, mass spectrometry
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:su:diva-737 (URN)91-7155-166-2 (ISBN)
Public defence
2005-12-19, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2005-11-25 Created: 2005-11-25 Last updated: 2011-04-27Bibliographically approved

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