title: Resonance Raman intensity analysis of the A band short-time photochemical dynamics of 4,5-ethylenedithio-1,3-dithiole-2-thione.
abstract: Resonance Raman spectra (RRs) for 4,5-ethylenedithio-1,3-dithiole-2-thione (EDDT) were obtained with 397.9 and 416 nm excitation wavelengths, and density functional calculations were performed to elucidate the electronic transitions and the RRs of EDDT in chloroform solvent. The RRs indicate that the Franck-Condon region photodynamics have multidimensional character with nuclear motion predominantly along the C(4)═C(5) stretch and the C(4)═C(5) twist out-of-plane. Resonance Raman cross-sections of A-band absorption have been obtained for the vibrational modes of EDDT with its excitation frequencies spanning the 408 nm. Resonance Raman intensity analysis of the resulting RRs excitation profiles and absorption spectrum using a time-dependent wave packet formalism yields mode-specific nuclear displacement and vibrational reorganizational energies. The intensity analysis results for EDDT were compared to previously reported results for dimethyl 1,3-dithiole-2-thione-4,5-dicarboxylate (DDTD), which shows that the additional six-member heterocycle of EDDT strongly affects the reorganizational energy and energy participation. The authors briefly discuss the differences and similarities of the spectra in terms of molecular symmetry and electron density.
authors.affiliation: State Key Laboratory of Advanced Textiles Materials and Manufacture Technology, Engineering Research Center for Eco-dyeing and Finishing of Textiles, MOE, Zhejiang Sci-Tech University, Hangzhou, P R China. zdwhg@163.com
authors.forename: Huigang
authors.initials: H
authors.lastname: Wang
authors.forename: Wenfei
authors.initials: W
authors.lastname: Zhang
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Shaosong
authors.initials: S
authors.lastname: Shen
authors.forename: Xuming
authors.initials: X
authors.lastname: Zheng
authors.forename: Kemei
authors.initials: K
authors.lastname: Pei
authors.forename: Lijiang
authors.initials: L
authors.lastname: Chen