Assignment of the λ1369.13 Diffuse Interstellar Absorption Band and Three Other Far-Ultraviolet Interstellar Absorption Lines to the CH Molecule

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DOIResolve DOI: http://doi.org/10.1086/321480
AuthorSearch for:
TypeArticle
Journal titleThe Astrophysical Journal
Volume555
Issue1
Pages472476; # of pages: 5
AbstractThe three unidentified interstellar lines λλ1368.74, 1369.13, and 1370.87 are here assigned to the CH molecule, including the diffuse interstellar band (DIB) at 1369.13 Å. A consistent rotational assignment of the interstellar lines and the 3d-X 2Π laboratory spectrum is presented. The predominant broadening mechanism of the lines appears to be predissociation, which is found to be greater for lines with upper levels of d parity, including the DIB, than for lines with upper levels of c parity. The oscillator strength of the 3d-X 2Π transition is estimated to be f ≈ 0.033. Using the theoretical n* dependence of the parameters together with the wavenumber of the observed laboratory Q-form branch, an unidentified interstellar line at 1270.96 Å is assigned to the strongest line of the 4d-X 2Π transition of CH.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12328230
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Record identifier59db320d-4755-4371-98ea-c05dc5acac28
Record created2009-09-10
Record modified2016-07-18
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