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arXiv · 1904.04380

Circular holographic ionization-phase meter

Stefan Donsa·Nicolas Douguet·Joachim Burgdörfer·Iva Březinová·Luca Argenti
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Abstract

We propose an attosecond XUV-pump IR-probe photoionization protocol that employs pairs of counter-rotating consecutive harmonics and angularly resolved photoelectron detection, thereby providing direct measurement of ionization phases. The present method, which we call circular holographic ionization-phase meter (CHIP), gives also access to the phase of photoemission amplitudes of even-parity continuum states from a single time-delay measurement, since the relative phase of one- and two-photon ionization pathways is imprinted in the photoemission anisotropy. The method is illustrated with \emph{ab initio} simulations of photoionization via autoionizing resonances in helium. The rapid phase excursion in the transition amplitude to both the dipole-allowed $(2s2p)^1$P$^{\rm o}$ and the dipole-forbidden $(2p^2)^1$D$^{\rm e}$ states are faithfully reproduced.

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Stefan Donsa, Nicolas Douguet, Joachim Burgdörfer, Iva Březinová, Luca Argenti. 2019-04-08. Circular holographic ionization-phase meter. https://doi.org/10.1103/physrevlett.123.133203

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