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Photodissociation dynamics of OCS at 207 nm: the S(1D2) + CO(X1Σ+) product channel
Bai Xi-lin
University of Science and Technology of China
Abstract:
By using the direct current (DC) slice velocity map imaging (VMI) technique, the polarization experiment for S(1D2) products from the UV photodissociation of carbonyl sulfide (OCS) at 207 nm were studied. The angular momentum polarization character of the photofragment, S(1D2), was detected via two different resonance enhanced multiphoton ionization (REMPI) intermediate states, 1F3 and 1P1, and four different pump-probe laser polarization geometries. The angular distribution of the corresponding CO(X1Σ+) coproducts were extracted and analyzed using the molecular-frame polarization and the laboratory-frame anisotropy models. The observed total kinetic energy release spectrum indicates that there are three dissociation channels, corresponding to the low, medium, and high kinetic energy. The sources of the low and medium kinetic energy channels are consistent with that of bimodal translational energy distribution at longer photolysis wavelengths. The high kinetic energy channel is a new dissociation channel arising from the direct dissociation from the single repulsive A(21A′) state.
Key words:  Photodissociation dynamics, carbonyl sulfide, velocity map imaging
FundProject:
Photodissociation dynamics of OCS at 207 nm: the S(1D2) + CO(X1Σ+) product channel
白西林
School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China
摘要:
By using the direct current (DC) slice velocity map imaging (VMI) technique, the polarization experiment for S(1D2) products from the UV photodissociation of carbonyl sulfide (OCS) at 207 nm were studied. The angular momentum polarization character of the photofragment, S(1D2), was detected via two different resonance enhanced multiphoton ionization (REMPI) intermediate states, 1F3 and 1P1, and four different pump-probe laser polarization geometries. The angular distribution of the corresponding CO(X1Σ+) coproducts were extracted and analyzed using the molecular-frame polarization and the laboratory-frame anisotropy models. The observed total kinetic energy release spectrum indicates that there are three dissociation channels, corresponding to the low, medium, and high kinetic energy. The sources of the low and medium kinetic energy channels are consistent with that of bimodal translational energy distribution at longer photolysis wavelengths. The high kinetic energy channel is a new dissociation channel arising from the direct dissociation from the single repulsive A(21A′) state.
关键词:  Photodissociation dynamics, carbonyl sulfide, velocity map imaging
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