Analysis of Rotational Transitions of Methyl Formate in the Ground and First Excited Torsional StatesAuthor(s): Hitoshi Odashima | Kazumi Ogata | Kojiro Takagi | Shozo Tsunekawa
Journal: Molecules ISSN 1420-3049
Volume: 8; Issue: 1; Start page: 139; Date: 2003;
Keywords: Methyl formate | HCOOCH3 | microwave spectrum | rotational transition | internal axis method | interstellar molecule
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.