Optogalvanic signals, caused by laser-excited Rydberg atoms, were measured to estimate the electric field in a DC glow discharge in helium. With a careful analysis of the various factors limiting the detection limit and an experiment to check the analysis, the detection limit of an electric field of 21.5 V/mm was obtained which was limited by the laser spectral width.
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Yamagata et al. (1989) studied this question.
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