New even-parity fine structure levels of the Lanthanum atom discovered by means of optogalvanic spectroscopy

Laser excitation of an Ar-La plasma, generated in a hollow cathode discharge lamp, has allowed to us observe a huge number of spectral lines that could not be interpreted as transitions between already known La energy levels. From the observed hyperfine structure patterns and fluorescence lines, we...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2014-08, Vol.47 (16), p.165001-13
Main Authors: Gamper, B, Głowacki, P, Siddiqui, Imran, Dembczyński, J, Windholz, L
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Atomic properties and interactions with photons
Energy levels
Exact sciences and technology
Excitation
Fine and hyperfine structure
Fine structure
Fluorescence
Hyperfine structure
Lasers
Optogalvanic spectroscopy
Physics
Plasma (physics)
Properties of atoms and atomic ions
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Summary:Laser excitation of an Ar-La plasma, generated in a hollow cathode discharge lamp, has allowed to us observe a huge number of spectral lines that could not be interpreted as transitions between already known La energy levels. From the observed hyperfine structure patterns and fluorescence lines, we derived 37 new La levels, all with even parity, in the energy range between 38 000 cm−1 and 43 000 cm−1. The existence of these levels was then proved by excitations from other known lower levels.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/47/16/165001