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Radiative Lifetime of a Bound Excited State of Te-
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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2004 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 92, no 25, 253002- p.Article in journal (Refereed) Published
Abstract [en]

We report on the first experimental study of the lifetime of a bound excited state of a negative ion. A new experimental technique was developed and used to measure the radiative lifetime of the 5p52P1/2 level of Te-. The experiment was performed in a magnetic storage ring, where a laser beam was applied along one of the straight sections. In the experiment the population of the excited J=1/2 level was probed each time the Te- ions passed through the laser field. A decay curve was built up by sampling the population of the excited level of the Te- ions as a function of time after injection into the ring. A multiconfiguration Dirac-Hartree-Fock calculation was performed in conjunction with the experiment. The calculation yielded a radiative lifetime of 0.45 s, in excellent agreement with the measured value of 0.42(5) s.

Place, publisher, year, edition, pages
2004. Vol. 92, no 25, 253002- p.
Identifiers
URN: urn:nbn:se:su:diva-25165DOI: 10.1103/PhysRevLett.92.253002OAI: oai:DiVA.org:su-25165DiVA: diva2:199020
Note
Part of urn:nbn:se:su:diva-7768Available from: 2008-05-27 Created: 2008-05-20 Last updated: 2010-10-21Bibliographically approved
In thesis
1. Laser Spectroscopic Investigations of Decay Properties in Stored Ions
Open this publication in new window or tab >>Laser Spectroscopic Investigations of Decay Properties in Stored Ions
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Investigations and measurements of metastable states are in many ways very important. Spectroscopists, theorists and astrophysicists have all great interest and requirements regarding knowledge about such states and their properties. One of the interesting properties is the lifetime of each state and lifetime measurements are therefore of great importance. It is necessary to have a long observation time when performing investigations on metastable states in ions and there are some different methods to fulfill this requirement. One method to store ions is to use an ion storage ring in which the ions are bent in circle by a magnetic or an electrostatic field. The storage ring method combined with a laser probing technique constitutes the basis for the papers described in this thesis. The thesis also contains some theoretical background to the experiments together with explanations regarding the experimental setup, the procedure for the laser probing technique and the systematic effects that have to be considered. The thesis includes results from nine different positive and negative singly charged ions. The experimental and theoretical results are presented and compared.

The experiments have been done in collaboration with E. Biémont's theoretical group in Belgium, with S. Johansson's astrophysical group in Lund and D. Hanstorp's group in Gothenburg.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2008. 221 p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-7768 (URN)978-91-7155-680-6 (ISBN)
Public defence
2008-06-17, sal FD5, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00
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Available from: 2008-05-27 Created: 2008-05-20 Last updated: 2010-09-14Bibliographically approved

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