Dissociative ionization and Coulomb explosion of CH3I in intense femto second laser fields

Dongdong Zhang, Sizuo Luo, Haifeng Xu, Mingxing Jin, Fuchun Liu, Bing Yan, Zhigang Wang, Hang Liu, Dianwu Jiang, Andre Eppink, Wim Roeterdink, Steven Stolte, Dajun Ding

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The interaction of CH3I molecules with 100 fs 800 nm linearly polarized laser fields has been investigated at the intensity region from 2.6 x 10(14) to 5.8 x 10(14) W/cm(2) by means of a velocity map imaging method. The kinetic energy distribution of the various atomic fragment ions Iq+ (q = 1-3) has been measured and reproduced by a fit of multiple Gaussian functions. Several dissociative ionization and Coulomb explosion channels were identified for Iq+ (q = 1-3). As expected for a geometric alignment dominated interaction process the anisotropic angular recoil distributions of the atomic ion fragments are peaked in the laser polarization direction. The kinetic energy release (KER) of Iq+ (q = 1-3) depending upon the laser intensity has been investigated. The relative weight of the various contributions from the identified dissociative ionization (DI) and Coulomb explosion (CE) channels is found to depend strongly on the laser intensity.
Original languageEnglish
Article number148
JournalEuropean Physical Journal D. Atomic, Molecular, Optical and Plasma Physics
Volume71
Issue number6
DOIs
Publication statusPublished - 13 Jun 2017

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