Astron. Astrophys. Suppl. Ser. 139, 163-166
Laser-excited fluorescence spectra of lanthanum monoxide
A. Bernard1 - F. Taher2 - A. Topouzkhanian3 - G. Wannous3
Send offprint request: A. Bernard
1 - CRAL-Observatoire de Lyon, 9 avenue Charles André, F-69561 Saint-Genis-Laval Cedex,
2 - Groupe de Physique Moléculaire et Applications, CNRS Libanais, Beyrouth, Liban
3 - Laboratoire de Spectrométrie Ionique et Moléculaire (LASIM), CNRS et Université Claude Bernard-Lyon I, 43 Bd. du Onze Novembre 1918, F-69622 Villeurbanne Cedex, France
Received March 9; accepted May 26, 1999
Fluorescence spectra of lanthanum monoxide excited by selected Ar+ and Kr+ laser lines have been analysed by Fourier transform spectrometry. Rotational levels in the electronic state have been populated either directly or after collisional relaxation, inducing many fluorescence transitions to the ground state to 5). Under our experimental conditions, bands of the sequence of the system also appear, fairly developed.
A global treatment of the wavenumbers of some 830 lines in 9 bands of the system, involving the levels v'=0 to 4 and v''=0 to 5, is carried out. The consistent set of accurate effective spectroscopic constants for both electronic states, directly obtained at equilibrium, is expected to be useful for high resolution syntheses of S-type stellar spectra.
Key words: molecular data -- line: identification