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Quantum control of electron‐proton symmetry breaking in dissociative ionization of H 2 by intense laser pulses
Author(s) -
Daud Mohammad Noh,
Lu Huizhong,
Chelkowski Szczepan,
Bandrauk Andre D.
Publication year - 2015
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.24845
Subject(s) - ionization , asymmetry , electron , atomic physics , wave packet , dissociation (chemistry) , above threshold ionization , proton , physics , electron ionization , chemistry , photoionization , ion , quantum mechanics
Forward and backward electron/proton ionization/dissociation spectra from one‐dimensional non‐Born‐Oppenheimer H 2 molecule exposed to ultrashort intense laser pulses ( I = 4 × 10 14W/cm 2 , 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 H 2 has been established. It is found that the symmetry breaking of electron‐proton distribution with π periodic modulation occurs for all CEPs except for n 20 ° − n 30 °( n = integer) and the largest asymmetry coming from the CEP of n 110 ° . 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 ofH 2 +to the dissociation channel and the time delay of electrons in asymmetric ionization. © 2014 Wiley Periodicals, Inc.