A cw dye laser operating at 6563 Å has been used to measure Doppler broadened absorption profiles of atomic hydrogen in a glow discharge using optogalvanic detection. In the cathode fall region, neutral hydrogen atoms were observed having kinetic energies >140 eV. In the negative glow and positive column average kinetic energies correspond more nearly to thermal velocities.
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R. D. May (1985) studied this question.
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