The enhancement of the rate coefficient for the radiative association of He and H + to form HeH + arising from stimulated emission due to a blackbody radiation field is calculated. The effects on the fractional abundance of HeH + in the early universe, in supernova ejecta, and in planetary nebulae are small. There may occur some enhancement in the abundance of HeH + in quasar broad-line clouds.
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Zygelman et al. (1998) studied this question.
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