Other
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...60..949p&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 60, April 1986, p. 949-961.
Other
26
Astronomical Spectroscopy, Formates, Interstellar Matter, Methyl Compounds, Millimeter Waves, Molecular Spectra, Ground State, Tables (Data), Transition Probabilities
Scientific paper
Over 250 rotational transitions of the internal rotor methyl formate (HCOOCH3) in its ground v(t) = 0 degenerate (E) torsional substate have been measured in the millimeter-wave spectral region. These data and a number of E-state lines identified by several other workers have been analyzed using an extension of the classical principal-axis method in the high barrier limit. The resulting rotational constants allow accurate prediction of the v(t) = 0 E substate methyl formate spectrum below 300 GHz between states with angular momentum J not greater than 30 and rotational energy of not more than 350/cm. The calculated transition frequencies for the E state, when combined with the results of the previous analysis of the ground-symmetric, nondegenerate state, account for over 200 of the emission lines observed toward Orion in a recent survey of the 215-265 GHz band.
Blake Geoffrey A.
de Lucia Frank C.
Herbst Eric
Plummer Grant M.
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