Rovibrationally Resolved Photodissociation of HeH

Accurate photodissociation cross sections have been obtained for the A1 Delta *S+ arrow left X1 Delta *S+ 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 level...

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Bibliographic Details
Published in:The Astrophysical journal 2011-07, Vol.735 (1), p.21-jQuery1323906923958='48'
Main Authors: Miyake, S, Gay, C. D, Stancil, P. C
Format: Article
Language:English
Subjects:
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CATIONS
CHARGED PARTICLES
CROSS SECTIONS
DISSOCIATION
Earth, ocean, space
Exact sciences and technology
HELIUM COMPOUNDS
HELIUM HYDRIDES
HYDRIDES
HYDROGEN COMPOUNDS
IONS
PROTOPLANETS
RARE GAS COMPOUNDS
UNIVERSE
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Summary:Accurate photodissociation cross sections have been obtained for the A1 Delta *S+ arrow left X1 Delta *S+ 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 Delta *l Delta *l100-1129. Assuming a Boltzmann distribution of the rovibrational levels of the X1 Delta *S+ 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 X1 Delta *S+ 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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/735/1/21