2226 20160701171701.0 10.1088/0004-637X/746/1/78 DOI ASTROimport-383 Gay, C. D. 2012 Rovibrationally Resolved Direct Photodissociation through the Lyman and Werner Transitions of H2 for FUV/X-Ray-irradiated Environments Using ab initio potential curves and dipole transition moments, cross-section calculations were performed for the direct continuum photodissociation of H2 through the B 1Σ+ u -- X 1Σ+ g (Lyman) and C 1Π u -- X 1Σ+ g (Werner) transitions. Partial cross-sections were obtained for wavelengths from 100 Å to the dissociation threshold between the upper electronic state and each of the 301 bound rovibrational levels v''J'' within the ground electronic state. The resulting cross-sections are incorporated into three representative classes of interstellar gas models: diffuse clouds, photon-dominated regions, and X-ray-dominated regions (XDRs). The models, which used the CLOUDY plasma/molecular spectra simulation code, demonstrate that direct photodissociation is comparable to fluorescent dissociation (or spontaneous radiative dissociation, the Solomon process) as an H2 destruction mechanism in intense far-ultraviolet or X-ray-irradiated gas. In particular, changes in H2 rotational column densities are found to be as large as 20% in the XDR model with the inclusion of direct photodissociation. The photodestruction rate from some high-lying rovibrational levels can be enhanced by pumping from H Lyβ due to a wavelength coincidence with cross-section resonances resulting from quasi-bound levels of the upper electronic states. Given the relatively large size of the photodissociation data set, a strategy is described to create truncated, but reliable, cross-section data consistent with the wavelength resolving power of typical observations. Abel, N. P. Porter, R. L. Stancil, P. C. Ferland, G. J. Shaw, G. van Hoof, P. A. M. Williams, R. J. R. The Astrophysical Journal 746 1 2012 78 http://esoads.eso.org/abs/2012ApJ...746...78G published in REFERD