Global fit of rotational transitions of methyl formate (HCOOCH3) in the ground and first excited torsional states |
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Authors: | Kazumi Ogata Kojiro Takagi Shozo Tsunekawa |
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Affiliation: | Department of Physics, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan |
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Abstract: | The microwave spectrum of methyl formate (HCOOCH3) has been observed in the frequency range from 7 to 200 GHz. New 348 lines were assigned to E-species in the first excited torsional state. By combining these lines with previously reported data, a global analysis of A- and E-species lines of the ground and first excited torsional states were carried out on the basis of the internal axis method. A total of 3862 transitions were fitted to a Hamiltonian model involving 69 molecular parameters to a weighted unitless standard deviation of 1.96. |
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Keywords: | Methyl formate HCOOCH3 Microwave spectrum Rotational transition Internal axis method Interstellar molecule |
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