title: Electronic structure of H2CS3 and H2CS4: an experimental and theoretical study.
abstract: The HeI photoelectron spectra of H2CS3 and H2CS4 in the gas phase have been obtained for the first time. A complete theoretical study involving the calculation of the ionization energies using orbital valence Green's functional (OVGF) and population analysis was performed. Calculations of cation-radical forms were carried out in order to interpret the main characters of the six highest occupied molecular orbitals (HOMOs). The first vertical ionization potentials are 8.74 and 8.56eV for H2CS3 and H2CS4, and attributed to {9b2(nS(C=S))}-1 and {8a"(3ppi*(S-S), nS)}-1, respectively. Meanwhile, the energy sequence of three types of sulfur 3p lone-pair have been discussed: 3ppi(S-S)*<nS(C=S)<n(S3p), and an energy splitting DeltaE=2.06 eV of 3ppi(S-S) and 3ppi(S-S)* orbitals in H2CS4 is observed.
authors.affiliation: Department of Chemistry, Shaoxing University, Shaoxing, Zhejiang 312000, PR China. liymj@mail.sxptt.zj.cn
authors.forename: Yimin
authors.initials: Y
authors.lastname: Li
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Zeng
authors.forename: Qiao
authors.initials: Q
authors.lastname: Sun
authors.forename: Haiyang
authors.initials: H
authors.lastname: Li
authors.forename: Maofa
authors.initials: M
authors.lastname: Ge
authors.forename: Dianxun
authors.initials: D
authors.lastname: Wang
mesh_terms: D002255:Carbonic Acid / Q000737:chemistry*; D004583:Electrons; D008956:Models, Chemical; D013057:Spectrum Analysis
chemical_list: D002255:Carbonic Acid