Ultraviolet photodissociation of the SD radical in vibrationally ground and excited states

Literature Information

Publication Date 2009-03-18
DOI 10.1039/B900332K
Impact Factor 3.676
Authors

Xianfeng Zheng, Jingze Wu, Yu Song, Jingsong Zhang


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Abstract

Ultraviolet (UV) photodissociation dynamics of the SD radical in vibrationally ground and excited states (X 2Π3/2, v″ = 0–5) are investigated in the photolysis wavelength region of 220 to 244 nm using the high-n Rydberg atom time-of-flight (HRTOF) technique. The UV photodissociation dynamics of SD (X 2Π3/2) from v″ = 0–5 are similar to each other and to that of SH studied previously. The anisotropy parameter of the D-atom product is ∼−1; the spin–orbit branching fractions of the S(3PJ) products are essentially constant, with an average S(3P2) : S(3P1) : S(3P0) = 0.51 : 0.37 : 0.12. The UV photolysis of SD is a direct dissociation from the repulsive 2Σ− state following the perpendicular 2Σ−–X 2Π excitation. The S(3PJ) product fine-structure state distributions approach that in the sudden limit dissociation on the single repulsive 2Σ− curve, but they are also affected by nonadiabatic couplings among the repulsive 4Σ−, 2Σ−, and 4Π states. A bond dissociation energy D0(S–D) = 29 660 ± 25 cm−1 is obtained.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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