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Wavelengths, energy levels and HFS in Ho II
Stockholm University, Faculty of Science, Department of Physics. (Atomfysik)
Lunds universitet, Department of Physics Catholic University of American, NASA Goddard Space Flight Center.
National Institute of Standards and Technology, Atomic Physics Division.
Laboratoire Aimé-Cotton, Observatoire de Paris-Meudon.
2009 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 79, no 3, 035306- p.Article in journal (Refereed) Published
Abstract [en]

We recorded spectra of Ho II emitted by hollow-cathode lamps, using the ultraviolet Fourier transform spectrometer (FTS) at Lund Observatory and the 2-m FTS at the National Institute of Standards and Technology. The combined wavenumber coverage spans the interval from 8000 cm-1 to 49600 cm-1(12500 Å to 2016 Å). We measured 303 lines in these spectra and used them to determine energies and hyperfine structure constants of 100 levels. Ofthese, 41 energy levels have not been reported previously and hyperfine structure constants have not been reported previously for 83 levels. Comparisonsbetween the hyperfine structure constants and energy levels presented in this article and those previously determined from other studies are included anddiscrepancies are discussed. A theoretical study of the odd-parity levels leads to hyperfine structure parameters and to predictions for unknown excited levelsof the ground-state configuration.

Place, publisher, year, edition, pages
2009. Vol. 79, no 3, 035306- p.
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-27771DOI: 10.1088/0031-8949/79/03/035306ISI: 000263891000013OAI: oai:DiVA.org:su-27771DiVA: diva2:218004
Available from: 2009-05-18 Created: 2009-05-18 Last updated: 2010-09-14Bibliographically 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

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