Abstract
The differential cross section for one-photon molecular detachment by an elliptically polarized field is analyzed for a one-electron molecular model comprised of an electron in the field of two (generally nonequivalent) attractive zero-range potentials (ZRPs) separated by the distance . A phenomenological parametrization of the photodetachment cross section for a fixed-in-space molecular system in terms of two scalar dynamical parameters is presented and circular dichroism effects are discussed. Analytic results for the dynamical molecular parameters within the ZRP molecular model are used to analyze interference phenomena (including two-center interference) and dichroic effects in the detached electron angular distributions and their dependence on the interatomic distance and on the orientation of the molecular axis with respect to the polarization plane. Numerical ZRP results for angular distributions are presented for both symmetric and asymmetric molecules in an elliptically polarized field.
Highlights
The great progress of attosecond science in producing short wavelength pulses of attosecond durations represents a major advance for the study of electronic dynamics in atomic and molecular systems [1,2,3,4]
We have presented an analytic description of one-photon molecular ionization/detachment by an elliptically polarized monochromatic field based on a simple one-electron, two-center molecular model
The general parametrization (5) for the differential cross section simplifies significantly in two particular cases: (i) the perpendicular geometry (in which the molecular axis is perpendicular to the polarization plane, see Equation (12)); and (ii) the polarization plane geometry (in which both the molecular axis and the photoelectron momentum lie in the polarization plane of a circularly polarized field, see Equation (13))
Summary
The great progress of attosecond science in producing short wavelength pulses of attosecond durations represents a major advance for the study of electronic dynamics in atomic and molecular systems [1,2,3,4]. This parametrization involves a geometrical factor, given in terms of scalar products of the vectors of the problem, and two scalar dynamical parameters. The dichroic term dσCD/d in Equation (8) causes a difference in the photodetachment cross sections for elliptically polarized fields with opposite handedness, ξ = ±|ξ |: CD dσ (ξ ) d This difference is largest for circularly polarized fields and for a geometry in which both the momentum p of the detached electron and the molecular axis R lie in the polarization plane.
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