Issue |
Astron. Astrophys. Suppl. Ser.
Volume 117, Number 2, June I 1996
|
|
---|---|---|
Page(s) | 377 - 392 | |
DOI | https://doi.org/10.1051/aas:1996163 | |
Published online | 15 June 1996 |
Computed distributions of rotovibrational transitions in
1
Department of Chemistry, The University of Rome, Cittá Universitaria, 00185 Rome, Italy
2
Laboratoire de Physique Quantique, Université Paul Sabatier, 118 Rue de Narbonne, 31062 Toulouse Cedex, France
Send offprint request to: F.A. Gianturco
Received:
6
October
1995
Accepted:
21
November
1995
Accurate potential energy curves for the ground electronic
states of LiH and are employed to generate
vibrational and rotational levels over a broad range of J
values for both systems. The corresponding dipole functions are
computed and used to obtain the frequency and intensity
distributions of all relevant transitions between bound states
for pure vibrational excitations, pure rotational excitations
and for dipole allowed rovibrational processes. This
extensive set of absorption data for both molecules is employed
to locate the most likely region in the infrared spectrum where
characteristic lines could be observed. Such data should be
useful in experimental attempts to search for LiH and
lines at high redshifts. We found that transitions
between ionic levels will be markedly less intense than those
for the neutral system and that transitions between rotationally
`hot' levels will be markedly more intense than those between
low-J levels.
Key words: molecular data / cosmology: miscellaneous
© European Southern Observatory (ESO), 1996