Photodissociation of CS from Excited Rovibrational Levels

Pattillo, R. J.; Cieszewski, R.; Stancil, P. C.; Forrey, R. C.; Babb, J. F.; McCann, J. F.; McLaughlin, B. M.

doi:10.3847/1538-4357/aab5b9

Photodissociation of CS from Excited Rovibrational Levels

Journal Article · Fri Apr 27 00:00:00 EDT 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aab5b9· OSTI ID:1544056

Pattillo, R. J. ^[1]; Cieszewski, R. ^[1]; ^[1]; ^[2]; ^[3]; McCann, J. F. ^[4]; ^[4]

Univ. of Georgia, Athens, GA (United States). Dept. of Physics
Penn State Univ., Reading, PA (United States). Dept. of Physics
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Queen's Univ., Belfast, Northern Ireland (United Kingdom). School of Mathematics and Physics

Accurate photodissociation cross sections have been computed for transitions from the X ¹Σ+ ground electronic state of CS to six low-lying excited electronic states. New $ab$ initio potential curves and transition dipole moment functions have been obtained for these computations using the multi-reference configuration interaction approach with the Davidson correction (MRCI+Q) and aug-cc-pV6Z basis sets. State-resolved cross sections have been computed for transitions from nearly the full range of rovibrational levels of the X ¹Σ+ state and for photon wavelengths ranging from 500 Å to threshold. Destruction of CS via predissociation in highly excited electronic states originating from the rovibrational ground state is found to be unimportant. Photodissociation cross sections are presented for temperatures in the range between 1000 and 10,000 K, where a Boltzmann distribution of initial rovibrational levels is assumed. Applications of the current computations to various astrophysical environments are briefly discussed focusing on photodissociation rates due to the standard interstellar and blackbody radiation fields.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

OSTI ID:: 1544056

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 858; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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