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

Abstract

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 × 10 14 to 5.8 × 10 14 W/cm 2 by means of a velocity map imaging method. The kinetic energy distribution of the various atomic fragment ions I q+ (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 I q+ (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 I q+ (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.

Multi-channel photodissociation and XUV-induced charge transfer dynamics in strong-field-ionized methyl iodide studied with time-resolved recoil-frame covariance imaging

“…The ionization and dissociation dynamics of CH 3 I following exposure to intense IR light has been the subject of several previous studies 48,[57][58][59][60][61][62][63] . The ionic states populated and the resultant kinetic energy and angular distributions of the fragment ions are sensitive to both the duration and intensity of the IR pulse.…”

Coulomb explosion imaging of CH3I and CH2ClI photodissociation dynamics

“…The very low kinetic energy feature (labeled III in Fig. 4) is assigned to multiphoton dissociative ionization induced by either the pump or probe pulses, [58][59][60] III :…”

Multiple ionization and Coulomb explosion of molecules, molecular complexes, clusters and solid surfaces

“…Despite this, we have listed here only selected studies performed from 2004 to data on Coulomb explosion of isolated large molecules initiated by femtosecond laser pulses. The family of molecules include aliphatic and [52,125,[141][142][143][144][145][146][147][148][149][150][151][152][153][154][155][156][157][158][159] aromatic hydrocarbons [92,[160][161][162], halogenated molecules [33,42,[163][164][165][166][167][168][169][170][171][172][173][174][175][176] and alcohols [49,51,53,155,[177][178]…”