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The laboratory millimeter-wave spectrum of methyl formate in its ground torsional E stateOver 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.
Document ID
19860052536
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Plummer, G. M.
(Duke Univ. Durham, NC, United States)
Herbst, E.
(Duke Univ. Durham, NC, United States)
De Lucia, F. C.
(Duke University Durham, NC, United States)
Blake, G. A.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1986
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 60
ISSN: 0067-0049
Subject Category
Astrophysics
Accession Number
86A37274
Funding Number(s)
CONTRACT_GRANT: NAGW-189
Distribution Limits
Public
Copyright
Other

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