Microwave spectroscopy of (HCOOCH3)-C-13 in the second methyl torsional excited state

作者：Kobayashi Kaori; Kuwahara Takuro; Tachi Haruka; Urata Yuki; Tsunekawa Shozo; Hayashi Naoto; Higuchi Hiroyuki; Fujitake Masaharu; Ohashi Nobukimi

来源：Journal of Molecular Spectroscopy, 2018, 343: 50-53.

DOI：10.1016/j.jms.2017.08.006

• Methyl formate
• Isotopologue
• Internal rotation
• Microwave spectroscopy
• Pseudo-PAM method

The new experimental results and analysis of the microwave spectra of (HCOOCH3)-C-13 in the second methyl torsional excited state are reported. Pseudo-principal axis method (pseudo-PAM) was successfully applied to the normal methyl formate in the second torsional excited state and again applied to this isotopologue. We succeeded to assign 536 A-species transitions up to 1 = 33 and K-a = 15 and 417 E-species transitions up to J = 32 and K-a = 14. Thirty parameters were used to do the least-squares-analysis by using the pseudo-PAM Hamiltonian consisting of rotational, centrifugal distortion, and internal-rotational constants.

• 出版日期2018-1