Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Precision spectroscopy of atoms and ions IV (with A)
Q 34.4: Talk
Thursday, March 20, 2014, 11:15–11:30, BEBEL SR140/142
Systematic laser-spectroscopic investigations of the La spectrum — •Tobias Binder1, Bettina Gamper1, Jerzey Dembczynski2, and Laurentius Windholz1 — 1Institut für Experimentalphysk, TU Graz, Petersgasse 16, A-8010 Graz, Österreich — 2Chair of Quantum Engineering and Metrology, TU Poznan, Pl-60-965 Poznan, Polan
While performing laser excitation of transitions within the spectrum of Lanthanum atoms, we quite often realized that excitation is possible even at wavelengths for that no emission lines are known. Thus we made a continuous laser scan over a wide spectral range: from 5833 to 5650 Å. Within this region we found, using optogalvanic detection, several hundreds of transitions, most of them up to now unknown combinations between already known energy levels. Moreover, several lines could not be interpreted and did lead to the discovery of new, up to now unknown energy levels. In several cases we had to correct existing levels in their J-value. The final goal of the investigations is a semi-empirical interpretation of the La levels in order to find their designations and wave-function compositions.