Quantum control of electron‐proton symmetry breaking in dissociative ionization of H2 by intense laser pulses |
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| Authors: | Mohammad Noh Daud Huizhong Lu Szczepan Chelkowski Andre D Bandrauk |
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| Affiliation: | 1. Department of Chemistry, University of Malaya, Malaysia;2. Laboratoire de Chimie Theorique, Faculte des Sciences, Universite de Sherbrooke, Sherbrooke, Quebec, Canada |
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| Abstract: | Forward and backward electron/proton ionization/dissociation spectra from one‐dimensional non‐Born‐Oppenheimer H2 molecule exposed to ultrashort intense laser pulses (  W/cm2, λ = 800 nm) have been computed by numerically solving the time‐dependent Schrödinger equation. The resulting above‐threshold ionization and above‐threshold dissociation spectra exhibit the characteristic forward‐backward asymmetry and sensitivity to the carrier‐envelope phase (CEP), particularly for high energies. A general framework for understanding CEP effects in the asymmetry of dissociative ionization of H2 has been established. It is found that the symmetry breaking of electron‐proton distribution with π periodic modulation occurs for all CEPs except for  (  integer) and the largest asymmetry coming from the CEP of  . At least one of the electron and proton distributions is asymmetric when measured simultaneously. Inspection of the nuclear and electron wave packet dynamics provides further information about the relative contribution of the gerade and ungerade states of  to the dissociation channel and the time delay of electrons in asymmetric ionization. © 2014 Wiley Periodicals, Inc. |
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| Keywords: | intense laser pulses dissociative ionization carrier envelope phase asymmetry distribution time‐dependent Schrodinger equation |
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