Relaxation times for establishing steady state populations in optically thin helium plasmas |
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| Authors: | M S Hegde P K Ghosh |
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| Institution: | (1) Department of Chemistry, Indian Institute of Technology, 208 016 Kanpur;(2) Present address: Solid State and Structural Chemistry Unit, Indian Institute of Science, 560 012 Bangalore |
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| Abstract: | Population densities of HeI and HeII excited states are calculated from a collisional radiative model for non-LTE optically
thin helium plasmas. Effect of direct ionisation-excitation of HeI to HeII states on the population density of HeII states
is shown. Relaxation times for HeI states calculated from the CR model is reported forT
e from 3 to 18 eV andn
e from 109 to 1016 cm−3.
Part of a research project supported by the Department of Atomic Energy. |
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| Keywords: | Non-LTE plasmas collisional radiative model relaxation time |
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