title: Infrared spectra of HSCS+, c-HSCS, and HCS2-produced on electron bombardment of CS2in solid para-hydrogen.
abstract: We report infrared (IR) spectra of HSCS+, c-HSCS, HCS2-, and other species produced on electron bombardment of a mixture of CS2and para-hydrogen (p-H2) during deposition at 3.2 K. After maintenance of the deposited matrix in darkness for 12 h, the intensities of the absorption lines of HSCS+at 2477.2 (ν1), 1525.6 (ν2), and 919.6 cm-1(ν3) decreased through neutralization of HSCS+with trapped electrons. During this period, the intensities of the lines of HCS2-at 2875.7 (ν1), 1249.9 (ν5), 1003.2 (ν6), and 814.3 cm-1(ν4) increased due to reaction between H and CS2-. The intensities of the lines observed at 2312.7 and 889.0 cm-1, which are assigned to the c-HSCS radical, increased after maintenance in darkness and greatly diminished after irradiation at 373 nm. The IR spectra of HSCS+, HCS2-, and c-HSCS are reported for the first time. The IR absorption lines of the t-HSCS radical, t-HC(S)SH, and c-HC(S)SH were also identified; their wavenumbers are similar to those reported for these species in an Ar matrix. The corresponding spectra of the13C,34S, and D isotopic variants of these species were observed. The assignments were made according to the expected chemical behavior, predicted potential energies of associated reactions, and a comparison of observed and predicted wavenumbers and their13C,34S, and D isotopic ratios. In contrast to the observed significant red shifts of the OH-stretching wavenumbers of HOCO+and HOCS+in solid p-H2compared to those in the gaseous phase due to proton sharing with H2, the wavenumber of the HS-stretching mode of HSCS+in solid p-H2(2477.2 cm-1) is similar to the anharmonic wavenumber of HSCS+(2424 cm-1) predicted with the B3LYP/aug-cc-pVTZ method, indicating that the sharing of a proton between HSCS+and neighboring H2molecules is insignificant.
authors.affiliation: Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, Taiwan. tsuge@nctu.edu.tw yplee@mail.nctu.edu.tw.
authors.forename: Masashi
authors.identifier: http://orcid.org/0000-0001-9669-1288
authors.initials: M
authors.lastname: Tsuge
authors.affiliation: Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, Taiwan. tsuge@nctu.edu.tw yplee@mail.nctu.edu.tw and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
authors.forename: Yuan-Pern
authors.identifier: http://orcid.org/0000-0001-6418-7378
authors.initials: YP
authors.lastname: Lee