Other
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stin...9731954d&link_type=abstract
Technical Report, NASA/CR-97-206103; NRO-439; NAS 1.26:206103
Other
Ethylene Oxide, Molecular Gases, Interstellar Chemistry, Abundance, Heterocyclic Compounds, Chemical Composition, Molecular Interactions, Line Spectra, Interstellar Matter
Scientific paper
We report the identification of 10 transitions which support the detection of the small cyclic molecule ethylene oxide (c-C2H40) in SgrB2(N). Although one of these transitions is severely blended, such that an accurate intensity and linewidth could not be determined, and two other lines are only marginally detected, we have done gaussian fits to the remaining 7 lines and have performed a rotation diagram analysis. Our results indicate a rotation temperature, Trot = 18 K, and a molecular column density, N(c-C2H40) = 3.3 x 1014cm-2, corresponding to a fractional abundance relative to molecular hydrogen of order 6 x 10exp -11). This is a factor of more than 200 higher than the abundance for this molecule suggested by the "new standard" chemistry model of Lee, Bettens, & Herbst (1996). This result suggests that grain chemistry might play an effective role in the production Of c-C2H40. No transitions of this molecule were detected in either SgrB2(M) or SgrB2(NW).
Dickens James E. Jr.
Hjalmarson Å..
Ikeda Maho
Irvine William M.
Ishikawa Sumio
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