Abstract
In a seminal article, Fano predicts that absorption of light occurs preferably with increase of angular momentum. We generalize Fano's propensity rule to laser-assisted photoionization, consisting of absorption of an extreme-ultraviolet photon followed by absorption or emission of an infrared photon. The predicted asymmetry between absorption and emission leads to incomplete quantum interference in attosecond photoelectron interferometry. It explains both the angular dependence of the photoionization time delays and the delay dependence of the photoelectron angular distributions. Our theory is verified by experimental results in Ar in the 20-40eV range.
Highlights
The possible transitions between different states are dictated by selection rules which are based on symmetry arguments
This Letter deals with laser-assisted photoionization, AþγXUV ÆγIR →Aþ þe−, where absorption of an extreme ultraviolet (XUV) photon brings an electron to the continuum, followed by absorption or stimulated emission of infrared (IR) laser radiation between continuum states
Laser-assisted photoionization is a cornerstone of attosecond science, used in the temporal characterization of XUV radiation, such as high-order harmonics [3,4,5] and the measurement of attosecond pulses using the reconstruction of attosecond beating by interference of two-photon transitions (RABBIT) scheme [6,7]
Summary
The possible transitions between different states are dictated by selection rules which are based on symmetry arguments. The predicted asymmetry between absorption and emission leads to incomplete quantum interference in attosecond photoelectron interferometry.
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