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Title: Enhanced ionization of the non-symmetric HeH{sup +} molecule driven by intense ultrashort laser pulses

We study enhanced single and double ionizations and enhanced single and double excitations in the nonsymmetric two-electron diatomic molecular ion HeH{sup +} in an intense ultrashort laser pulse linearly polarized along the internuclear axis (z axis). We solve a three-dimensional time-dependent Schrödinger equation, TDSE, via correlated two-electron ab initio calculations within the fixed-nuclei approximation. A complex scaling method is used for calculation of both single and double ionizations. These nonperturbative processes increase with large internuclear distance R and reach a maximum at some critical distance R{sub c} and decrease by further increase of R. This enhanced ionization (EI) at R{sub c} is accompanied by enhanced single and double excitation processes. Furthermore, EI is stronger when the permanent dipole moment of the molecule and the electric field at the peak of the laser pulse are antiparallel than when they are parallel. We predict analytically the R{sub c} at which the enhancement of all these molecular processes happens in HeH{sup +} from a simple quasistatic model and investigate the effect of Carrier Envelope Phase on these nonlinear nonperturbative processes.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Chemistry, University of Sistan and Baluchestan, Zahedan 98155-987 (Iran, Islamic Republic of)
  2. Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1 (Canada)
  3. Cancer Research Institute, Hopital C. LeMoyne, Greenfield Park, Québec J4V 2H1 (Canada)
Publication Date:
OSTI Identifier:
22224159
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 139; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; APPROXIMATIONS; DIPOLE MOMENTS; ELECTRIC FIELDS; EXCITATION; HELIUM COMPOUNDS; LASERS; MOLECULAR IONS; MULTI-PHOTON PROCESSES; PHOTOIONIZATION; PULSES; SCHROEDINGER EQUATION; TIME DEPENDENCE