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Spin-orbit delays in photoemission

I. Jordan, M. Huppert, S. Pabst, A. S. Kheifets, D. Baykusheva, and H. J. Wörner
Phys. Rev. A 95, 013404 – Published 10 January 2017

Abstract

Attosecond delays between photoelectron wave packets emitted from different electronic shells are now well established. Is there any delay between electrons originating from the same electronic shell but leaving the cation in different fine-structure states? This question is relevant for all attosecond photoemission studies involving heavy elements, be it atoms, molecules or solids. We answer this fundamental question by measuring energy-dependent delays between photoelectron wave packets associated with the P3/22 and P1/22 components of the electronic ground states of Xe+ and Kr+. We observe delays reaching up to 33±6 as in the case of Xe. Our results are compared with two state-of-the-art theories. Whereas both theories quantitatively agree with the results obtained for Kr, neither of them fully reproduces the experimental results in Xe. Performing delay measurements very close to the ionization thresholds, we compare the agreement of several analytical formulas for the continuum-continuum delays with experimental data. Our results show an important influence of spin-orbit coupling on attosecond photoionization delays, highlight the requirement for additional theory development, and offer a precision benchmark for such work.

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  • Received 12 July 2016

DOI:https://doi.org/10.1103/PhysRevA.95.013404

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

I. Jordan1, M. Huppert1, S. Pabst2,3, A. S. Kheifets4, D. Baykusheva1, and H. J. Wörner1,*

  • 1Laboratorium für Physikalische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
  • 2Center for Free-Electron Laser Science, DESY, Notkestrasse 85, D-22607 Hamburg, Germany
  • 3ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
  • 4Research School of Physical Sciences, The Australian National University, Canberra ACT 0200, Australia

  • *Corresponding author: hwoerner@ethz.ch; www.atto.ethz.ch

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Issue

Vol. 95, Iss. 1 — January 2017

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