Depolarisation rates of Ca II s, p and d levels by isotropic collisions with hydrogen atoms

Details Depolarisation rates of Ca II s, p and d levels by isotropic collisions with hydrogen atoms Depolarisation rates of Ca II s, p and d levels by isotropic collisions with hydrogen atoms

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...402....5k&link_type=abstract

Astronomy and Astrophysics, v.402, p.5-11 (2003)

Astronomy and Astrophysics

Astrophysics

4

Sun: Atmosphere, Atomic Processes, Line: Formation, Polarization

Scientific paper

Multipole relaxation and transfer rates of the 4s2S, 3d2D and 4p2P 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 200 K<=T<=10 000 K are given.

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