title: Fourier-transform microwave spectroscopy and determination of the three dimensional potential energy surface for Ar-CS.
abstract: Pure rotational transitions of the Ar-CS van der Waals complex have been observed by Fourier Transform Microwave (FTMW) and FTMW-millimeter wave double resonance spectroscopy. Rotational transitions of v(s) = 0, 1, and 2 were able to be observed for normal CS, together with those of C(34)S in v(s) = 0, where vs stands for the quantum number of the CS stretching vibration. The observed transition frequencies were analyzed by a free rotor model Hamiltonian, where rovibrational energies were calculated as dynamical motions of the three nuclei on a three-dimensional potential energy surface, expressed by analytical functions with 57 parameters. Initial values for the potential parameters were obtained by high-level ab initio calculations. Fifteen parameters were adjusted among the 57 parameters to reproduce all the observed transition frequencies with the standard deviation of the fit to be 0.028 MHz.
authors.affiliation: Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan.
authors.forename: Chisato
authors.initials: C
authors.lastname: Niida
authors.affiliation: Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan.
authors.forename: Masakazu
authors.initials: M
authors.lastname: Nakajima
authors.affiliation: Division of Pure and Applied Science, Faculty of Science and Technology, Gunma University, Aramaki 4-2, Maebashi, Gunma 371-8510, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Sumiyoshi
authors.affiliation: Department of Photo-Molecular Science, Institute for Molecular Science, Okazaki 444-8585, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ohshima
authors.affiliation: Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kohguchi
authors.affiliation: Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan.
authors.forename: Yasuki
authors.initials: Y
authors.lastname: Endo