Abstract
The polarization dependence of the photoionization probability was analyzed in the case when a randomly oriented atom is irradiated by two crossing polarized monochromatic photon beams with the same frequency. It was found that the angular distributions of photoelectrons exhibit the effect of circular dichroism (CD), which consists of the dependence of the photoionization probability on the sign of the circular polarization degree of each beam. We demonstrate that the CD effect exists only for coherent crossing photon beams. It was shown that CD effects are strongly dependent on the phase difference between the electric field vectors of the photon beams and have a quite large magnitude. The possibilities of the experimental observation of CD effects are discussed.
Highlights
circular dichroism (CD) effects manifest themselves as the dependence of the optical properties of media on the helicity of the photon beam
Note that the CD effect in the double photoionization vanishes when both electrons are emitted in opposite directions, since this situation is kinematically equivalent to the conventional single photoionization process
Beams, the DP has an asymmetry with respect to the change of helicities of both beams or one of the beams
Summary
CD effects manifest themselves as the dependence of the optical properties of media on the helicity of the photon beam (i.e., the sign of its circular polarization degree). The paper is organized as follows: In Section 2, we present the parametrization of the photoionization amplitude and probability in terms of scalar products of photon polarization vectors and the unit vector of photoelectron momentum p = p/p.
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