Anomalous absorption in rhomboidal SiC_3 molecules

Details Anomalous absorption in rhomboidal SiC_3 molecules Anomalous absorption in rhomboidal SiC_3 molecules

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008basi...36...55c&link_type=abstract

Bulletin of the Astronomical Society of India, Vol. 36, p. 55-64

Astronomy and Astrophysics

Astronomy

1

Interstellar Molecules, Sic_3

Scientific paper

Laboratory detection of two isomers of cyclic SiC_3 molecule have been reported by McCarthy et al. (1999a, 1999b) and Apponi et al. (1999b). Seven transitions of the isomer-I have been detected in IRC+10216 by Apponi et al. (1999a). However, to date, the second isomer is not detected in the interstellar space. Here, we propose identification of isomer-I through the transition 4_{22}-4_{23} at 0.2 GHz and of isomer-II through the transitions 2_{20}-2_{21} at 4.44 GHz and 4_{40}-4_{41} at 2.16 GHz, in absorption against the cosmic microwave background (CMB). In absence of the availability of the collisional rates, we have used scaled values for them. However, we have checked the sensitivity of the lines on the rates by enhancing the rates for transitions with Δ k_a = 0 by a factor of 10 and the results are not found sensitive.

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