Coulomb-explosion imaging of concurrent CH2BrI photodissociation dynamics
Coulomb-explosion imaging of concurrent CH2BrI photodissociation dynamics
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DOI：
10.1103/physreva.96.043415
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发表时间：
2017-10-17
影响因子：
2.9
通讯作者：
Rolles, Daniel
中科院分区：
文献类型：
--
作者：
Burt, Michael;Boll, Rebecca;Rolles, Daniel
采用时间分辨库仑爆炸成像技术研究了271.6 nm激光诱导气相CH 2BrI分子光解的动力学过程。所观察到的延迟依赖的光碎片动量揭示了CH 2BrI经历C-I裂解，将65.6%的可用能量沉积到内部产物态，并且第二个UV光子的吸收破坏了C（H）2Br的C-Br键。模拟证实，这种机制是一致的，与以前的数据记录在248 nm，展示了库仑爆炸成像的灵敏度作为一个实时探头的化学动力学。
The dynamics following laser-induced molecular photodissociation of gas-phase CH2BrI at 271.6 nm were investigated by time-resolved Coulomb-explosion imaging using intense near-IR femtosecond laser pulses. The observed delay-dependent photofragment momenta reveal that CH2BrI undergoes C-I cleavage, depositing 65.6% of the available energy into internal product states, and that absorption of a second UV photon breaks the C-Br bond of C(H)2Br. Simulations confirm that this mechanism is consistent with previous data recorded at 248 nm, demonstrating the sensitivity of Coulomb-explosion imaging as a real-time probe of chemical dynamics.