THE ROTATIONAL SPECTRA OF 29SiC2 AND 30SiC2

被引：18
作者：
Kokkin, D. L. [1 ,2 ]
Bruenken, S. [2 ,3 ]
Young, K. H. [2 ]
Patel, N. A. [2 ]
Gottlieb, C. A. [2 ]
Thaddeus, P. [2 ]
McCarthy, M. C. [2 ]
机构：
[1] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[3] Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany
来源：
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2011年 / 196卷 / 02期
关键词：
ISM: molecules; line: identification; molecular data; radio lines: ISM; submillimeter: ISM; SILICON DICARBIDE SIC2; LINE SURVEY; MOLECULAR-SPECTROSCOPY; LABORATORY MEASUREMENT; COLOGNE DATABASE; EXCITED-STATE; IRC+10216; ENVELOPE; RESOLUTION; CDMS;
D O I：
10.1088/0067-0049/196/2/17
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页数：5
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