title: Vibrational structures of dimethyl sulfide and ethylene sulfide cations studied by vacuum-ultraviolet mass-analyzed threshold ionization (MATI) spectroscopy.
abstract: Adiabatic ionization energies of dimethyl sulfide (DMS) and ethylene sulfide (thiirane) are both accurately and precisely determined to be 8.6903 +/- 0.0009 and 9.0600 +/- 0.0009 eV, respectively, by vacuum-UV mass-analyzed threshold ionization (MATI) spectroscopy. Also reported are vibrational frequencies of DMS and thiirane monocations. Simulations using a Franck-Condon analysis based on ab initio molecular structures reproduce the experimental findings quite well. Detailed vibrational structures are discussed with the aid of ab initio calculations. Ionization-induced structural changes provide the information about the role of the sulfur nonbonding orbital in the geometrical layout of the title compounds.
authors.affiliation: Department of Chemistry and School of Molecular Sciences (BK21), Korea Advanced Institute of Science and Technology (KAIST), Daejeon (301-750), Republic of Korea.
authors.forename: Sunyoung
authors.initials: S
authors.lastname: Choi
authors.forename: Kyo-Won
authors.initials: KW
authors.lastname: Choi
authors.forename: Sang Kyu
authors.initials: SK
authors.lastname: Kim
authors.forename: Sangyoon
authors.initials: S
authors.lastname: Chung
authors.forename: Sungyul
authors.initials: S
authors.lastname: Lee