Abstract
Theoretical aspects of photoelectron angular distributions are discussed with reference to bichromatic ionization by an FEL beam. Specifically, we consider an asymmetry in the angular distribution due to interference between the ionization paths from the fundamental and the second harmonic. The case of circularly polarized radiation is analyzed in detail in the vicinity of an intermediate resonance in the two-photon ionization paths. Similarities and differences to interference phenomena due to non-dipole effects are also discussed.
Highlights
The recent commissioning of free electron lasers (FELs), producing very high-brilliant femtosecond radiation pulses in the exteme ultraviolet (XUV) regime, has opened new avenues in the studies of such a developed field as the photoelectron angular distribution (PAD) in atomic photoionization
Keeping in mind applications to photoionization with new FELs, we theoretically studied interference effects in two-pathway ionization by the fundamental ω and its second harmonic 2 ω
The difference between ω − 2 ω interference and E1 − E2 interference in one-photon ionization in the PADs is related to the different tensorial structure of the corresponding transition operators, despite their identical ranks and parity properties
Summary
The recent commissioning of free electron lasers (FELs), producing very high-brilliant femtosecond radiation pulses in the exteme ultraviolet (XUV) regime, has opened new avenues in the studies of such a developed field as the photoelectron angular distribution (PAD) in atomic photoionization. This mixing breaks one of the symmetry planes in the PADs. One purpose of the present contribution is to discuss the similarities and differences between the ionization by a bichromatic field
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