The collisional enhancing of the magnetic dipole transition I(5(2)P((1/2))-5(2)P(3/2)) at 1.3152 microm by Xe is shown to proceed over an exciplex channel: I(5(2)P((1/2))) + Xe ? XeI((2)pi((1/2))) ? I(5(2)P(3/2)) + Xe + hnu(1.3 microm). The pseudo-first-order rate coefficient for this process is (1.6+/-0.2) x 10(-18) molecule(-1) cm(3) sec(-1)). The termolecular rate coefficient for XeI((2)pi((1/2))) excimer production is (2 +/- 1) x 10(-35) molecule(-2) cm(6) sec(-1). The radiative lifetime of the XeI excimer state is of the order of 100 nsec. Similar effects are briefly reported for C(2)F(6), SF(6), Kr, Ar, and i-C(3)F(7)I.
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Gerck et al. (1982) studied this question.
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