| Numéro |
J. Phys. Colloques
Volume 49, Numéro C1, Mars 1988
IAU Colloquium N° 102 on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas
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|---|---|---|
| Page(s) | C1-373 - C1-373 | |
| DOI | https://doi.org/10.1051/jphyscol:1988181 | |
IAU Colloquium N° 102 on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas
J. Phys. Colloques 49 (1988) C1-373-C1-373
DOI: 10.1051/jphyscol:1988181
Department of Physics, Visva-Bharati University, Santiniketan-731235, West Bengal, India
J. Phys. Colloques 49 (1988) C1-373-C1-373
DOI: 10.1051/jphyscol:1988181
COLLISIONAL DEPOPULATION OF EXCITED Na s STATES BY RARE GAS ATOMS
D. CHATTARJI et U. ROYDepartment of Physics, Visva-Bharati University, Santiniketan-731235, West Bengal, India
Abstract
Our work was motivated by measurements made by Gallagher and Cooke1 on depopulation cross sections of Na s states from n = 6 to 11 due to collision with He, Ar and Xe atoms at thermal velocities. These cross sections were much smaller than those associated with collisional l mixing, the maximum values for He, Ar and Xe being ~20, 20 and 100 A2. They rose from ~0.1 A2 at n~6 to a plateau a t n~10. The small size of the cross sections sugqests that the depopulation proceeds through direct interaction between the Na+ core and the rare gas atom.