内壳层光电离二氟碘苯的异构体碎裂动力学
Isomer-Dependent Fragmentation Dynamics of Inner-Shell Photoionized Difluoroiodobenzene
摘要：
利用符合电子和离子动量成像技术研究了碘4 $d$内壳层软X射线光电离2，6-和3，5-二氟碘苯的裂解动力学。通过分析三重离子符合事例中碘离子和氟离子的动量关联，我们可以在实验上区分这两种同分异构体。经典库仑爆炸模拟与实验确定的碎片离子动能和动量相关性总体一致，并指向不同的碎裂机制和时间尺度。虽然大多数三体碎裂通道显示出明显的证据，表明在大于碎片旋转周期的时间尺度上连续碎裂，但分裂成碘和氟阳离子以及第三个带电的共碎片似乎发生在几百飞秒内-一个大于碎片旋转周期的时间尺度，其他通道的分裂似乎发生在几百飞秒内。
英文摘要：
The fragmentation dynamics of 2,6- and 3,5-difluoroiodobenzene after iodine 4$d$ inner-shell photoionization with soft X-rays are studied using coincident electron and ion momentum imaging. By analyzing the momentum correlation between iodine and fluorine cations in three-fold ion coincidence events, we can distinguish the two isomers experimentally. Classical Coulomb explosion simulations are in overall agreement with the experimentally determined fragment ion kinetic energies and momentum correlations and point toward different fragmentation mechanisms and time scales. While most three-body fragmentation channels show clear evidence for sequential fragmentation on a time scale larger than the rotational period of the fragments, the breakup into iodine and fluorine cations and a third charged co-fragment appears to occur within a few hundred femtoseconds -- a time scale larger than the rotational period of the fragments, the breakup in other channels appears to occur within a few hundred femtoseconds.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
