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Annual Meeting Optical Society of America

Polar asymmetry of photoionization by a field with nonzero cube: theory and experiment

N. B. Baranova, A. N. Chudinov, Шульгинов Александр Анатольевич, B. Ya. Zel’dovich.

Published Jan 1, 1993• 0 citations
Publisher

Abstract

Interference of ionization by two photons hw+hw and by coherent photon h2w result in up-down asymmetry of emission probability.
DOI
10.1364/oam.1993.fg.5

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Using the reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) technique, a nonzero phase difference is observed in the two-photon ionization transition of krypton atoms into the ionization channels 2P1/2^{2}P_{1/2}2P1/2​ and 2P3/2^{2}P_{3/2}2P3/2​ when an electron is removed from the 4p4p4p shell. The phase difference is studied for excitation energies ranging from $\ensuremath{\approx}18\phantom{\rule{0.28em}{0ex}}\mathrm{eV}$ up to $\ensuremath{\approx}28\phantom{\rule{0.28em}{0ex}}\mathrm{eV}$. The phase differences are found to depend on the relative directions of linear polarization of the photoionization laser pulses and the pulses inducing the subsequent continuum-continuum transition. The experimental results are compared to phase differences calculated on the basis of dipole matrix elements for photoionization and scattering phases known for krypton from earlier experiments. The results indicate that the RABBITT phase differences do not give an obvious direct access to time-delay differences in the primary photoionization step of the atom.
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