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The Optogalvanic Spectrum of Neutral Lanthanum between 5610 and 6110 Å

Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
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Atoms 2020, 8(2), 23; https://doi.org/10.3390/atoms8020023
Received: 22 April 2020 / Revised: 11 May 2020 / Accepted: 15 May 2020 / Published: 19 May 2020
(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
We report on a complete optogalvanic spectrum of a discharge burning in a La-Ar gas mixture, in the spectral range 5610–6110 Å (17,851 to 16,364 cm−1). About 1900 overlapping laser scans, each between 1 and 1.5 cm−1 wide, were necessary to cover this range. The resolution of the spectra is limited by the Doppler width of the spectral features to about 0.03 cm−1 (or ca. 0.01 Å) and is comparable with a Fourier-transform spectrum, but the sensitivity is much higher. Indeed, we could find more than 1800 lines, from which about 800 could be classified as transitions between known energy levels. The main focus of the investigations was to discover previously unknown energy levels by means of excitation of unclassified spectral features.
Keywords: laser spectroscopy; new energy levels; lanthanum atom laser spectroscopy; new energy levels; lanthanum atom
MDPI and ACS Style

Windholz, L.; Binder, T. The Optogalvanic Spectrum of Neutral Lanthanum between 5610 and 6110 Å. Atoms 2020, 8, 23.

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