Ultraviolet photodissociation of the SD radical in vibrationally ground and excited states
文献情報
Xianfeng Zheng, Jingze Wu, Yu Song, Jingsong Zhang
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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