Dissociative ionization of methane in an elliptical pulse shaped laser field

Irani, E ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.molstruc.2014.09.026
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. The effect of strong femto-second laser pulses on the dissociation probability of methane has been investigated analytically in various arrangements. The ellipticity dependence of the dissociation probability at intensities from 1014 W cm-2 to 1016 W cm-2 for Ti:Sapphire laser is presented. A reliable calculation of the dissociation probability based on 3D time-dependent Schrodinger equation with an improved model of time-dependent density-functional theory is presented. These calculations are carried out for three different cases of elliptically polarized laser pulse, optimum convolution of dual short pulses, and two-color mixed nonresonant laser pulses. It is found that the rescattering contribution of the laser pulses to the fragmental yields is more remarkable for ε = 0.2, at 1015 W cm-2 laser intensity. Furthermore, by using the dual pulses combination for three proposed conditions, extracted by semi-classical approach, the dissociation rates up to 78% is achieved. In addition, by using a two-color mixed laser pulse, the total dissociation probability is improved up to 50% in comparison to a single pulse
  6. Keywords:
  7. Ellipticity Dissociation probability ; Molecular dynamics ; Dissociation probability ; Dissociative ionization ; Laser fields ; Time dependent density functional theory ; Methane
  8. Source: Journal of Molecular Structure ; Volume 1079 , January , 2015 , Pages 454-459 ; 00222860 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0022286014009272