Two- and three-body fragmentation of multiply charged tribromomethane by ultrafast laser pulses
Two- and three-body fragmentation of multiply charged tribromomethane by ultrafast laser pulses
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DOI：
10.1039/d2cp03089f
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发表时间：
2022-10-27
影响因子：
3.3
通讯作者：
Rolles, Daniel
中科院分区：
文献类型：
--
作者：
Bhattacharyya, Surjendu;Borne, Kurtis;Rolles, Daniel
研究了峰值强度为6×10(14)W cm(-2)的28飞秒近红外激光脉冲多次电离引起的三溴甲烷(溴仿，CHBr3)的二体和三体碎裂。分析的重点是完全由离子碎片组成的通道，这些通道是通过符合动量成像测量的。主要的两体碎裂通道是Br2++CHBr2+。还观察到较弱的HBr++CBr2+、CHBr2++Br2(+)、CHBr2++Br2-2(+)和Br2++CHBr22+通道，其中一些通道需要在碎裂之前或期间进行键重排。主要的三体碎裂通道为Br2++Br2++CHBr2+。该通道包括协调的和顺序的碎片路径，我们使用原生帧分析方法来识别它们。我们将测量的动能释放和动量关联与经典库仑爆炸模拟的结果进行了比较，并讨论了CHBr3在碎裂前可能异构化为BrCHBrBR(iso-CHBr3)。
We investigate the two- and three-body fragmentation of tribromomethane (bromoform, CHBr3) resulting from multiple ionization by 28-femtosecond near-infrared laser pulses with a peak intensity of 6 x 10(14) W cm(-2). The analysis focuses on channels consisting exclusively of ionic fragments, which are measured by coincidence momentum imaging. The dominant two-body fragmentation channel is found to be Br+ + CHBr2+. Weaker HBr+ + CBr2+, CHBr+ + Br-2(+), CHBr2+ + Br-2(+), and Br+ + CHBr22+ channels, some of which require bond rearrangement prior to or during the fragmentation, are also observed. The dominant three-body fragmentation channel is found to be Br+ + Br+ + CHBr+. This channel includes both concerted and sequential fragmentation pathways, which we identify using the native frames analysis method. We compare the measured kinetic energy release and momentum correlations with the results of classical Coulomb explosion simulations and discuss the possible isomerization of CHBr3 to BrCHBr-Br (iso-CHBr3) prior to the fragmentation.