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The kinetics of atomic and molecular excited states following a fast discharge in pure high-pressure helium are resolved on a nanosecond time scale by emission and absorption spectroscopy. Evidence is presented indicating that the Hopfield continuum (600–1100 Å) radiation occurs as a terminal process in a collisional-radiative cascade subsequent to the electronic recombination of He+2 ions. The radiated peak power in this wavelength range reaches several kW at atmospheric pressure.
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Gand et al. (1979) studied this question.
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