| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 139, Number 1, October I 1999
|
|
|---|---|---|
| Page(s) | 163 - 166 | |
| DOI | https://doi.org/10.1051/aas:1999505 | |
| Published online | 15 October 1999 | |
Laser-excited fluorescence spectra of lanthanum monoxide*
The 
system
1
CRAL-Observatoire de Lyon, 9 avenue Charles André, F-69561 Saint-Genis-Laval Cedex, France
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
Send offprint request to: A. Bernard
Received:
9
March
1999
Accepted:
26
May
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 
to 4 and 
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
© European Southern Observatory (ESO), 1999