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  Recoil-Induced Asymmetry of Nondipole Molecular Frame Photoelectron Angular Distributions in the Hard X-ray Regime

Kircher, M., Rist, J., Trinter, F., Grundmann, S., Waitz, M., Melzer, N., et al. (2019). Recoil-Induced Asymmetry of Nondipole Molecular Frame Photoelectron Angular Distributions in the Hard X-ray Regime. Physical Review Letters, 123(24): 243201. doi:10.1103/PhysRevLett.123.243201.

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 Creators:
Kircher, M.1, Author
Rist, J.1, Author
Trinter, Florian2, 3, Author           
Grundmann, S.1, Author
Waitz, M.1, Author
Melzer, N.1, Author
Vela-Pérez, I.1, Author
Mletzko, T.1, Author
Pier, A.1, Author
Strenger, N.1, Author
Siebert, J.1, Author
Janssen, R.1, Author
Schmidt, L. Ph. H.1, Author
Artemyev, A. N.4, Author
Schöffler, M. S.1, Author
Jahnke, T.1, Author
Dörner, R.1, Author
Demekhin, Ph. V.4, Author
Affiliations:
1Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany, ou_persistent22              
2FS-PETRA-S, Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany, ou_persistent22              
3Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
4Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany, ou_persistent22              

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 Abstract: We investigate angular emission distributions of the 1s photoelectrons of N2 ionized by linearly polarized synchrotron radiation at hν=40  keV. As expected, nondipole contributions cause a very strong forward-backward asymmetry in the measured emission distributions. In addition, we observe an unexpected asymmetry with respect to the polarization direction, which depends on the direction of the molecular fragmentation. In particular, photoelectrons are predominantly emitted in the direction of the forward nitrogen atom. This observation cannot be explained via asymmetries introduced by the initial bound and final continuum electronic states of the oriented molecule. The present simulations assign this asymmetry to a novel nontrivial effect of the recoil imposed to the nuclei by the fast photoelectrons and high-energy photons, which results in a propensity for the ions to break up along the axis of the recoil momentum. The results are of particular importance for the interpretation of future experiments at x-ray free electron lasers operating in the few tens of keV regime, where such nondipole and recoil effects will be essential.

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Language(s): eng - English
 Dates: 2019-10-122019-12-102019-12-13
 Publication Status: Issued
 Pages: 6
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.123.243201
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: 6 Volume / Issue: 123 (24) Sequence Number: 243201 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/conehttps://pure.mpg.de/cone/journals/resource/954925433406_1