000002226 001__ 2226
000002226 005__ 20160701171701.0
000002226 0247_ $$2DOI$$a10.1088/0004-637X/746/1/78
000002226 037__ $$aASTROimport-383
000002226 100__ $$aGay, C. D.
000002226 245__ $$aRovibrationally Resolved Direct Photodissociation through the Lyman and Werner Transitions of H2 for FUV/X-Ray-irradiated Environments
000002226 260__ $$c2012
000002226 520__ $$aUsing ab initio potential curves and dipole transition moments, cross-section calculations were performed for the direct continuum photodissociation of H2 through the B 1Σ+  u  -- X 1Σ+  g  (Lyman) and C 1Π u  -- X 1Σ+ g  (Werner) transitions. Partial cross-sections were obtained for wavelengths from 100 Å to the dissociation threshold between the upper electronic state and each of the 301 bound rovibrational levels v''J'' within the ground electronic state. The resulting cross-sections are incorporated into three representative classes of interstellar gas models: diffuse clouds, photon-dominated regions, and X-ray-dominated regions (XDRs). The models, which used the CLOUDY plasma/molecular spectra simulation code, demonstrate that direct photodissociation is comparable to fluorescent dissociation (or spontaneous radiative dissociation, the Solomon process) as an H2 destruction mechanism in intense far-ultraviolet or X-ray-irradiated gas. In particular, changes in H2 rotational column densities are found to be as large as 20% in the XDR model with the inclusion of direct photodissociation. The photodestruction rate from some high-lying rovibrational levels can be enhanced by pumping from H Lyβ due to a wavelength coincidence with cross-section resonances resulting from quasi-bound levels of the upper electronic states. Given the relatively large size of the photodissociation data set, a strategy is described to create truncated, but reliable, cross-section data consistent with the wavelength resolving power of typical observations. 
000002226 700__ $$a Abel, N. P.
000002226 700__ $$a Porter, R. L.
000002226 700__ $$a Stancil, P. C.
000002226 700__ $$a Ferland, G. J.
000002226 700__ $$a Shaw, G.
000002226 700__ $$a van Hoof, P. A. M.
000002226 700__ $$a Williams, R. J. R.
000002226 773__ $$c78$$i1$$pThe Astrophysical Journal$$v746$$y2012
000002226 85642 $$ahttp://esoads.eso.org/abs/2012ApJ...746...78G
000002226 905__ $$apublished in
000002226 980__ $$aREFERD