OBSERVATION OF POPULATION INVERSIONS IN FREELY EXPANDING PURE
HYDROGEN PLASMAS
Hara,T., Kodera,K., Hamagaki,M., Matsunaga,K., Inutake,M., Dote,T.: 1980,
Jpn.J.Appl.Phys., 19, L386.
The possibility of a hydrogen plasmadynamic recombination laser is
experimentally investigated. A high density plasma produced by a high-power
quasi-steady MPD arc-jet is cooled by expanding itself into the vacuum chamber.
Experimental results confirm that large population inversions between i=4-3
and i=5-3 levels exist over 12-22 cm downstream of the anode. A comparison
is made between experimental data and calculated results based on the
collisional-radiative model on population of hydrogen levels.
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