Two-body dissociation of formic acid following double ionization by ultrafast laser pulses
Two-body dissociation of formic acid following double ionization by ultrafast laser pulses
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DOI：
10.1103/physreva.105.053112
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发表时间：
2022-05
影响因子：
2.9
通讯作者：
T. Severt;Darwin R. Daugaard;Tiana Townsend;F. Ziaee;K. Borne;S. Bhattacharyya;K. Carnes;D. Rolles;A. Rudenko;E. Wells;I. Ben-Itzhak
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作者：
T. Severt;Darwin R. Daugaard;Tiana Townsend;F. Ziaee;K. Borne;S. Bhattacharyya;K. Carnes;D. Rolles;A. Rudenko;E. Wells;I. Ben-Itzhak
我们研究了平面甲酸 (HCOOH) 分子在强超短激光脉冲双电离后的碎裂。氘标记（即 HCOOD）与所有碎片离子的重合动量成像测量相结合，能够确定羟基和羧基氢原子在裂解中的作用。具体来说，我们观察到羟基（OD）基团在断裂时强烈倾向于保持完整，这更有可能一个数量级。在去质子化通道中观察到，与 O-H 键相比，更倾向于破坏 H-C 键。导致形成的键重排不表现出同位素偏好。分裂通道的动能释放分布表明，不止一种过程促成了这些最终产品，尽管需要进一步的理论工作来确定具体路径。
We studied the fragmentation of planar formic acid (HCOOH) molecules following their double ionization by intense ultrashort laser pulses. Deuterium tagging (i.e., HCOOD) combined with coincidence momentum imaging measurements of all fragment ions enabled determination of the role of the hydroxyl and carboxyl hydrogen atoms in the breakup. Specifically, we observe a strong preference for the hydroxyl (OD) group to remain intact in afragmentation, which is an order of magnitude more likely than. An even larger preference for breaking the H-C bond over the O-H bond is observed in theanddeprotonation channels. Bond rearrangement, leading toorformation, exhibits no isotopic preference. The kinetic-energy-release distributions of theandbreakup channels suggest that more than one process contributes to these final products, although further theoretical work is needed to identify the specific paths.