SIMBAD references

Accurate photodissociation cross sections have been obtained for the A¹Σ⁺ ⟵ X¹Σ⁺ electronic transition of HeH⁺ using ab initio potential curves and dipole transition moments. Partial cross sections have been evaluated for all rotational transitions from the vibrational levels v'' = 0-11 and over the entire accessible wavelength range λλ100-1129. Assuming a Boltzmann distribution of the rovibrational levels of the X¹Σ⁺ state, photodissociation cross sections are presented for temperatures between 500 and 12,000 K. A similar set of calculations was performed for the pure rovibrational photodissociation in the X¹Σ⁺ electronic ground state, but covering photon wavelengths into the far-infrared. Applications of the cross sections to the destruction of HeH⁺ in the early universe and in UV-irradiated environments such as primordial halos and protoplanetary disks are briefly discussed.