Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...390..783k&link_type=abstract
Astronomy and Astrophysics, v.390, p.783-791 (2002)
Astronomy and Astrophysics
Astrophysics
12
Line: Formation, Polarization, Atomic Processes, Sun: Atmosphere
Scientific paper
Multipole relaxation and transfer rates due to isotropic collisions with neutral hydrogen atoms are calculated and a general expression for the hyperfine-structured levels are obtained. Evaluation of these rates has been carried out using accurate potential energy curves. The formulae given here for the depolarizing collisional rates should be useful for accurately modelling the complex linear polarization pattern of the Na I doublet in a complement to the ground state's depolarizing collisional rates which were presented in a previous paper (Kerkeni et al. \cite{KERB}) hereafter referred to as Paper I. Similarly the depolarizing collisional rates of the Mg I, Ca I, Sr I resonance lines should be useful for polarization studies.
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