Study of fragmentation dynamics for CO2q+ (q≤4) in strong laser fields

被引：0

作者：

Zhang S. ^{[1
,2
]}

Jiang W. ^{[2
,3
]}

Wang X. ^{[4
]}

Jiang Y. ^{[2
,3
,4
]}

Zhu Z. ^{[1
,2
,4
]}

机构：

[1] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai

[2] University of Chinese Academy of Sciences, Beijing

[3] Shanghai Advanced Institute, Chinese Academy of Sciences, Shanghai

[4] Shanghai Tech University, Shanghai

来源：

He Jishu/Nuclear Techniques | 2022年 / 45卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Coulomb explosion; Fragmentation mechanisms; Recoil ion momentum spectroscopy; Strong laser fields;

D O I：

10.11889/j.0253-3219.2022.hjs.45.050503

中图分类号：

学科分类号：

摘要：

Background: The research of molecular fragmentation dynamics has attracted extensive attention in the fields of physics, chemistry and biology. The major challenge in this field is to understand the selectivity of molecular bond breaking and to elucidate which parameters control bond fission. Purpose: This study aims to reveal the mechanism of two and three-body fragmentation of CO2 in strong laser fields and to elucidate the dynamics information of the ion fragmentation in the Coulomb explosion. Methods: The time-of-flight (TOF) and three-dimensional momentum distributions of ion fragments were obtained using a cold-target recoil ion momentum spectroscopy (COLTRIMS). Precise identification of the two-body and three-body dissociation channels of CO2 was determined by the photoion-photoion coincidence (PIPICO) and the photoion-photoion-photoion coincidence (PIPIPICO) techniques. The occurrence of sequential and non-sequential fragmentation during three-body dissociation was revealed by the momentum correlation between two O ions. Finally, the dynamics of the three-body fragmentation process was visualized by the Newton diagram. Results: Four two-body dissociation channels and three three-body dissociation channels for CO2q+ (q≤4) are identified with the coincidence technique. The kinetic energy release (KER) distribution of these dissociation channels is obtained from the three-dimensional momentum. Conclusions: The experiments reveal that the dynamic collimation mechanism plays a dominant role in the two-body fragmentation channels, and the ion fragments of the four two-body fragmentation channels are mainly emitted along the laser polarization direction with the significant anisotropic distribution. Non-sequential and sequential fragmentation of CO2 is separated and identified in the momentum correlation and Newtonian diagrams. In the first step of the sequential fragmentation of CO24+, the O2+ and CO2+ ionic fragments are always produced. It is further shown that the vibration and rotation of the CO2+ ion are shown to occur before the fragmentation of the second step. © 2022, Science Press. All right reserved.

引用

共 44 条

[1] Ullrich J, Moshammer R, Dorn A, Et al., Recoil-ion and electron momentum spectroscopy: reaction-microscopes, Reports on Progress in Physics, 66, 9, pp. 1463-1545, (2003)
[2] Wang E L, Shan X, Shi Y F, Et al., Momentum imaging spectrometer for molecular fragmentation dynamics induced by pulsed electron beam, The Review of Scientific Instruments, 84, 12, (2013)
[3] Chen L, Shan X, Zhao X, Et al., Two-body fragmentation dynamics of N2Oq+ (q=2,3) induced by electron-capture collisions with 5.7-keV/uXe15+, Physical Review A, 99, 1, (2019)
[4] Kim H K, Titze J, Schoffler M, Et al., Enhanced production of low energy electrons by alpha particle impact, Proceedings of the National Academy of Sciences, 108, 29, pp. 11821-11824, (2011)
[5] Khan A, Tribedi L C, Misra D., Observation of a sequential process in charge-asymmetric dissociation of CO2q+ (q=4,5) upon the impact of highly charged ions, Physical Review A, 92, 3, (2015)
[6] Wei B, Zhang Y, Wang X, Et al., Fragmentation mechanisms for methane induced by 55 eV, 75 eV, and 100 eV electron impact, The Journal of Chemical Physics, 140, 12, (2014)
[7] Wang E L, Shan X, Shen Z J, Et al., Three-body-fragmentation dynamics of CO24+ investigated by electron collisions at an impact energy of 500 eV, Physical Review A, 92, 6, (2015)
[8] Jiang Y H, Rudenko A, Perez-Torres J F, Et al., Investigating two-photon double ionization of D2 by XUV-pump-XUV-probe experiments, Physical Review A, 81, 5, (2010)
[9] Jiang Y H, Rudenko A, Kurka M, Et al., Few-photon multiple ionization of N2 by extreme ultraviolet free-electron laser radiation, Physical Review Letters, 102, 12, (2009)
[10] Moshammer R, Jiang Y H, Foucar L, Et al., Few-photon multiple ionization of Ne and Ar by strong free-electron-laser pulses, Physical Review Letters, 98, 20, (2007)

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