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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