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Title: Dicarbon Formation in Collisions of Two Carbon Atoms

Abstract

Abstract Radiative association cross sections and rates are computed, using a quantum approach, for the formation of C 2 molecules (dicarbon) during the collision of two ground-state C( 3 P ) atoms. We find that transitions originating in the C 1 Π g , d 3 Π g , and 1 5 Π u states are the main contributors to the process. The results are compared and contrasted with previous results obtained from a semiclassical approximation. New ab initio potential curves and transition dipole moment functions have been obtained for the present work using the multi-reference configuration interaction approach with the Davidson correction (MRCI+Q) and aug-cc-pCV5Z basis sets, substantially increasing the available molecular data on dicarbon. Applications of the current computations to various astrophysical environments and laboratory studies are briefly discussed, focusing on these rates.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1509933
Alternate Identifier(s):
OSTI ID: 1528859
Grant/Contract Number:  
AC02-05CH11231; PHY-1607396
Resource Type:
Published Article
Journal Name:
The Astrophysical Journal
Additional Journal Information:
Journal Name: The Astrophysical Journal Journal Volume: 876 Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
American Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; ISM: supernova remnants; molecular data; molecular processes

Citation Formats

Babb, James F., Smyth, R. T., and McLaughlin, B. M. Dicarbon Formation in Collisions of Two Carbon Atoms. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab1088.
Babb, James F., Smyth, R. T., & McLaughlin, B. M. Dicarbon Formation in Collisions of Two Carbon Atoms. United States. https://doi.org/10.3847/1538-4357/ab1088
Babb, James F., Smyth, R. T., and McLaughlin, B. M. Tue . "Dicarbon Formation in Collisions of Two Carbon Atoms". United States. https://doi.org/10.3847/1538-4357/ab1088.
@article{osti_1509933,
title = {Dicarbon Formation in Collisions of Two Carbon Atoms},
author = {Babb, James F. and Smyth, R. T. and McLaughlin, B. M.},
abstractNote = {Abstract Radiative association cross sections and rates are computed, using a quantum approach, for the formation of C 2 molecules (dicarbon) during the collision of two ground-state C( 3 P ) atoms. We find that transitions originating in the C 1 Π g , d 3 Π g , and 1 5 Π u states are the main contributors to the process. The results are compared and contrasted with previous results obtained from a semiclassical approximation. New ab initio potential curves and transition dipole moment functions have been obtained for the present work using the multi-reference configuration interaction approach with the Davidson correction (MRCI+Q) and aug-cc-pCV5Z basis sets, substantially increasing the available molecular data on dicarbon. Applications of the current computations to various astrophysical environments and laboratory studies are briefly discussed, focusing on these rates.},
doi = {10.3847/1538-4357/ab1088},
journal = {The Astrophysical Journal},
number = 1,
volume = 876,
place = {United States},
year = {Tue Apr 30 00:00:00 EDT 2019},
month = {Tue Apr 30 00:00:00 EDT 2019}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.3847/1538-4357/ab1088

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