Universität zu Köln

Kokkin, D. L., Bruenken, S., Young, K. H., Patel, N. A., Gottlieb, C. A., Thaddeus, P. and McCarthy, M. C. (2011). THE ROTATIONAL SPECTRA OF (SiC2)-Si-29 AND (SiC2)-Si-30. Astrophys. J. Suppl. Ser., 196 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 0067-0049

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Abstract

The rotational spectra of (SiC2)-Si-29 and (SiC2)-Si-30, two silicon isotopic species of the abundant astronomical ring (SiC2)-Si-28, have been characterized in the millimeter band between 140 and 360 GHz in a low pressure discharge through SiH4, C2H2, and Ar. Precise rotational and centrifugal distortion constants have been derived for both species by fitting a standard asymmetric top Hamiltonian to 38 a-type transitions of (SiC2)-Si-29 and 35 of (SiC2)-Si-30; the data sets include transitions up to K-a = 8 and at least J = 16. With these new measurements in hand, the most intense radio transitions of both species either have been measured or can now be predicted to better than 1 km s(-1) in equivalent radial velocity up to 500 GHz, more than adequate accuracy for spectral line identifications in circumstellar shells of evolved carbon stars such as IRC+10216 where SiC2 is conspicuous. More than 10 new lines of (SiC2)-Si-29 and (SiC2)-Si-30 have been identified between 295 and 354 GHz in the interferometric spectral line survey of IRC+10216 with the Submillimeter Array.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kokkin, D. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bruenken, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Young, K. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Patel, N. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gottlieb, C. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thaddeus, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED McCarthy, M. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-487917
DOI:	10.1088/0067-0049/196/2/17
Journal or Publication Title:	Astrophys. J. Suppl. Ser.
Volume:	196
Number:	2
Date:	2011
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	0067-0049
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SILICON DICARBIDE SIC2; LINE SURVEY; MOLECULAR-SPECTROSCOPY; LABORATORY MEASUREMENT; COLOGNE DATABASE; EXCITED-STATE; IRC+10216; ENVELOPE; RESOLUTION; CDMS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48791