4.6 Article

Dissociative Ionization and Coulomb Explosion of CHBrCl2 in Intense Near-Infrared Femtosecond Laser Fields

Journal

APPLIED SCIENCES-BASEL
Volume 12, Issue 10, Pages -

Publisher

MDPI
DOI: 10.3390/app12105014

Keywords

femtosecond laser fields; dissociative ionization; multiphoton ionization; Coulomb explosion

Funding

  1. Scientific Research Project for the Introduction Talent of Yancheng Institute of Technology [xjr2021069]
  2. National Natural Science Foundation of China [62076215]
  3. Natural Science Research in Higher Education Institutions of Jiangsu Province [21KJD520006]

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We experimentally demonstrate the dissociative photoionization of CHBrCl2 molecules in a femtosecond laser field. The low kinetic energy components are from the dissociative ionization process of single-charged molecular ions. The angular distribution of fragment Cl+ ions can be attributed to the features of dissociative state and molecular configuration, while that of Br+ ions results from the electronic wave-packet evolution and combination of the multi-dissociation processes. The high kinetic energy components are from the Coulomb explosion of multi-charged molecular ions, and the error of the C-Br distance involved in the Coulomb explosion can be explained by the movement of the effective charge center of the polyatomic molecule.
We experimentally demonstrate the dissociative photoionization of CHBrCl2 molecules in a femtosecond laser field by time-of-flight mass spectrum and dc-slice imaging technology. The results suggest that the low kinetic energy components are from the dissociative ionization process of single-charged molecular ions. The angular distribution of fragment Cl+ ions can be attributed to the features of dissociative state and molecular configuration, and that of Br+ ions results from the electronic wave-packet evolution and combination of the multi-dissociation processes. The high kinetic energy components are from the Coulomb explosion of multi-charged molecular ions, and the error of the C-Br distance involved in the Coulomb explosion can be explained by the movement of the effective charge center of the polyatomic molecule.

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