000002837 001__ 2837
000002837 005__ 20160706140436.0
000002837 037__ $$aASTROimport-994
000002837 100__ $$aStancil, P. C.
000002837 245__ $$aAccurate Photodissociation in UV and X-ray Irradiated Molecular Gas
000002837 260__ $$c2011
000002837 520__ $$aMolecules are primarily destroyed in diffuse and translucent regions, in protoplanetary disks, in cool stellar atmospheres, in photodissociation regions, and in x-ray dominated regions via photodissociation (PD) due to the incident radiation field. The majority of astrochemical/spectral modeling codes available today use pre-computed exponentially-attenuated photorates based on dust scattering/absorption for an ``average" interstellar cloud. Since there is clearly a large scatter in the dust properties and local radiation field for various environments in the Galaxy and beyond, the adoption of such pre-computed photorates can lead to considerable errors in predicted abundances. To improve current modeling capabilities, we are computing new rovibrationally-resolved PD cross sections for H_2, HD, HeH+, NH, C_2, CN, and CS and implementing the cross sections in the spectral simulation code Cloudy for explicit computation of local photorates. We present model results using the new photodissociation cross sections for a variety of environments emphasizing differences in total and state-specific molecular column densities. This work was partially supported by NASA grants NNG06GJ11G and HST-AR-11776.01-A, NSF grant AST-0607733, and the PRODEX Programme of ESA.
000002837 700__ $$aGay, C. D.
000002837 700__ $$aCieszewski, R. M.
000002837 700__ $$ael-Qadi, W.
000002837 700__ $$aKuri, A.
000002837 700__ $$aMiyake, S.
000002837 700__ $$aAbel, N.
000002837 700__ $$aPorter, R. L.
000002837 700__ $$aShaw, G.
000002837 700__ $$aFerland, G. J.
000002837 700__ $$avan Hoof, P. A. M.
000002837 773__ $$c134.03$$pBulletin of the American Astronomical Society$$v43$$y2011
000002837 85642 $$ahttp://esoads.eso.org/abs/2011AAS...21813403S
000002837 905__ $$apublished in
000002837 980__ $$aNONREF