Asymmetry of molecular frame photoelectron angular distributions in H 2 + by intense two-color attosecond pulses: coherent excitation and charge migration effects

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Abstract
Molecular frame photoelectron angular distributions (MFPADs) are theoretically studied by intense two-color attosecond linearly polarized laser pulses. Simulations are performed on aligned H 2 + from numerical solutions of corresponding time-dependent Schrödinger equations. Asymmetric MFPADs are produced by a time-delayed soft x-ray attosecond pulse in the presence of an extreme ultraviolet (XUV) pump pulse. We present the dependence of the asymmetry ratio Γ of the MFPADs on the laser parameters of the pump-probe pulses. The asymmetry ratio Γ varies with the time delay, illustrating the coherent superposition of electronic states. Altering the phase, intensity and duration of the pump pulse gives rise to a modulation of the asymmetry ratio Γ as well. Moreover, the asymmetry of the MFPADs disappears in the case of long duration probe pulses, illustrating the coherent charge migration dynamics on the attosecond time scale.
Funding Information
  • Fonds de Recherche du Québec - Nature et Technologies
  • Natural Sciences and Engineering Research Council of Canada
  • National Natural Science Foundation of China (11974007)

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