NEGATIVE ABSORPTION IN A NONEQUILIBRIUM HYDROGEN PLASMA
Gudzenko, L.I., Shelepin,L.A.: 1964, Sov.Phys.JETP., 18, 998.
Conditions are examined for which a nonequilibrium hydrogen plasma can
be regarded as a medium with a negative absorption sufficient for the
creation of a generator operating close to the frequencies of
ionization of hydrogen from the ground or low-lying levels.
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