Rovibrationally resolved photodissociation of HeH+

Abstract

Accurate photodissociation cross sections have been obtained for the A-X 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 100-1129 Angstrom. Assuming a Boltzmann distribution of the rovibrational levels of the X 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 X-X 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.

References in corpus (3)

• Photoprocesses in protoplanetary disks
• Effects of primordial chemistry on the cosmic microwave background
• The Far-Ultraviolet "Continuum" in Protoplanetary Disk Systems I: Electron-Impact H2 and Accretion Shocks

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• Revisiting the Formation of HeH${}^{+}$ in the Planetary Nebula NGC 7027
• Determination of photodissociation and radiative association cross sections from the same time-dependent calculation
• Non-thermal photons and direct photodissociation of H2, HD and HeH+ in the chemistry of the primordial Universe