Other
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..370j&link_type=abstract
Astrophysical Journal, Part 1, vol. 218, Dec. 1, 1977, p. 370-376.
Other
33
Abundance, Cyanides, Ethyl Compounds, Hydrogen Clouds, Interstellar Matter, Microwave Spectra, Nebulae, Acrylonitriles, Brightness Temperature, Ethane, Millimeter Waves, Molecular Rotation, Molecular Spectra, Radial Velocity, Rotational Spectra
Scientific paper
Twenty-four millimeter-wave emission lines of ethyl cyanide (CH3CH2CN) have been detected in the Orion Nebula (OMC-1) and seven in Sgr B2. To derive precise radial velocities from the astronomical data, a laboratory measurement of the rotational spectrum of ethyl cyanide has been made at frequencies above 41 GHz. In OMC-1, the rotational temperature of ethyl cyanide is 90 K (in good agreement with other molecules), the local-standard-of-rest radial velocity is 4.5 + or - 1.0 km/s (versus 8.5 km/s for most molecules), and the column density is 1.8 by 10 to the 14th power per sq cm (a surprisingly high figure for a complicated molecule). The high abundance of ethyl cyanide in the Orion Nebula suggests that ethane and perhaps larger saturated hydrocarbons may be common constituents of molecular clouds and have escaped detection only because they are nonpolar or only weakly polar.
Gottlieb Carl A.
Gottlieb E. W.
Guélin Michel
Johnson Richard D.
Litvak Marvin M.
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