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Lifetimes of metastable levels of singly ionized titanium : theory and experiment
Stockholm University, Faculty of Science, Department of Physics.
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2008 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 41, no 12Article in journal (Refereed) Published
Abstract [en]

This paper presents new theoretical lifetimes of metastable levels in singly ionized titanium, Ti II. Along with the lifetimes, transition probabilities for several decay channels from these metastable levels are presented. The calculations are supported by experimental lifetime determinations of the 3d3 b 2D5/2 and 3d2(3P)4s b 2P3/2 levels along with revised values of the previously published lifetimes of the 3d2(3P)4s b 4P5/2 and 3d2(3P)4s b 2P1/2 levels originating partly from a reanalysis utilizing a recently developed method applied on the previously recorded data and partly from new measurements. The presented theoretical investigation of lifetimes of metastable levels in Ti II shows that the HFR calculations are in general compatible with measurements performed using the ion storage ring CRYRING of Stockholm University. The transition probabilities of forbidden lines derived from the new lifetime values will be useful for the diagnostics of low density laboratory or astrophysical plasmas, particularly those encountered in the strontium filament found in the ejecta of η Carinae.

Place, publisher, year, edition, pages
2008. Vol. 41, no 12
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-25164DOI: 10.1088/0953-4075/41/12/125703ISI: 000257177700017OAI: oai:DiVA.org:su-25164DiVA: diva2:199019
Note
Part of urn:nbn:se:su:diva-7768Available from: 2008-05-27 Created: 2008-05-20 Last updated: 2010-09-12Bibliographically approved
In thesis
1. High Resolution Spectroscopy of Singly Charged Ions: Applications of Laser and Fourier Transform Techniques
Open this publication in new window or tab >>High Resolution Spectroscopy of Singly Charged Ions: Applications of Laser and Fourier Transform Techniques
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents measurements of fundamental properties of singly charged ionic systems including spectral wavelengths, lifetimes of excited states and branching fractions with the main focus on time resolved laser spectroscopy of stored ions providing lifetime measurements of metastable states. The results of these measurements have been used to determine energy levels and transition probabilities of the studied systems. The included experimental data are compared with results from calculations which provides evaluations of different theoretical models. The presented results have been applied by others to the field of atomic astrophysics in order to deduce electron densities and elemental abundances in ejecta of the supermassive star eta Carinae and have also been followed by additional work of theoreticians interested in comparisons with laboratory data. The thesis is a result of several collaborations in which Stockholm University has been providing lifetime measurements of metastable states, Lund Observatory and the National Institute of Standards and Technology have been providing wavelength and branching fraction measurements, Lund Laser Centre has been providing lifetime measurements of short-lived states and calculations have been performed by theoretical physicists from Université de Mons-Hainaut, Université de Liège, Queen's University of Belfast and Laboratoire Aimé Cotton.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 99 p.
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-42627 (URN)978-91-7447-134-2 (ISBN)
Public defence
2010-10-22, FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2010-09-30 Created: 2010-09-10 Last updated: 2010-10-01Bibliographically approved
2. 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
Opponent
Supervisors
Available from: 2008-05-27 Created: 2008-05-20 Last updated: 2010-09-14Bibliographically approved

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