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Analysis of Rotational Transitions of Methyl Formate in the Ground and First Excited Torsional States

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Author(s): Hitoshi Odashima | Kazumi Ogata | Kojiro Takagi | Shozo Tsunekawa

Journal: Molecules
ISSN 1420-3049

Volume: 8;
Issue: 1;
Start page: 139;
Date: 2003;
Original page

Keywords: Methyl formate | HCOOCH3 | microwave spectrum | rotational transition | internal axis method | interstellar molecule

ABSTRACT
The microwave spectrum of methyl formate has been observed in the 7-200 GHz region, and new 437 lines have been assigned to the first excited A torsional substate. Both excited state lines and ground state lines reported previously were analyzed simultaneously on the basis of an internal axis method Hamiltonian. A total of 3514 lines were fitted to a 10th-order reduced Hamiltonian model involving 67 molecular parameters to a 1s standard deviation of 179 kHz.