| Issue |
A&A
Volume 402, Number 1, April IV 2003
|
|
|---|---|---|
| Page(s) | 5 - 11 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361:20030228 | |
| Published online | 07 April 2003 | |
Depolarisation rates of Ca II s, p and d levels by isotropic collisions with hydrogen atoms
Laboratoire d'Étude du Rayonnement et de la Matière en Astrophysique, CNRS FRE 2460 – LERMA, Observatoire de Paris, Section de Meudon, 92195 Meudon, France
Corresponding author: B. Kerkeni, boutheina.kerkeni@chem.ox.ac.uk
Received:
30
July
2002
Accepted:
21
January
2003
Multipole relaxation and transfer rates of the 
S,
D and 
P states of Ca ii due to isotropic collisions
with neutral hydrogen atoms are calculated. Evaluation of these rates
have been carried out using accurate ab initio potential energy
curves. The collisional T-matrix elements required for these
calculations have been evaluated in a quantum mechanical description
including fine structure splitting. Analytical expressions of all the
rates valid for 
K are given.
Key words: Sun: atmosphere / atomic processes / line: formation / polarization
© ESO, 2003
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