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We investigate the photodissociation of the metastable triplet state of HeH+as well as its formation through the inverse process, radiative association. Inmodels of astrophysical plasmas, HeH+ is assumed to be present only in theground state, and the influence of the triplet state has not been explored. Itmay be formed by radiative association during collisions between a proton andmetastable helium, which are present in significant concentrations in nebulae.The triplet state can also be formed by association of He+ and H, although thisprocess is less likely to occur. We compute the cross sections and ratecoefficients corresponding to the photodissociation of the triplet state by UVphotons from a central star using a wave packet method. We show that thephotodissociation cross sections depend strongly on the initial vibrationalstate and that the effects of excited electronic states and non-adiabaticcouplings cannot be neglected. We then calculate the cross section and ratecoefficient for the radiative association of HeH+ in the metastable tripletstate.

Photodissociation and radiative association of HeH+ in the metastable triplet state