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De-excitation of He(3 1 S, 3 3 S) states by collisions with Ne, Ar, Kr and Xe atoms is mainly attributed to chemi-ionization. For He(3 3 P) states relaxation is attributed to chemi-ionization and a collisional radiative process to He(2 3 S) states.
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Kubota et al. (1975) studied this question.
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