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APS » Journals » Phys. Rev. Lett. » Volume 77 » Issue 19
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Phys. Rev. Lett. 77, 3975–3978 (1996)

Experimental Evidence for Circular Dichroism in the Double Photoionization of Helium

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J. Viefhaus1, L. Avaldi2, G. Snell1,3, M. Wiedenhöft1, R. Hentges1, A. Rüdel1, F. Schäfers4, D. Menke3, U. Heinzmann3, A. Engelns5, J. Berakdar6, H. Klar5, and U. Becker1
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
2Consiglio Nazionale delle Ricerche, Istituto di Metodologie Avanzate Inorganiche, Area delle Ricerca di Roma, CP 10, I-00016 Monterotondo Scalo, Italy
3Fakultät für Physik, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
4Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung mbH, Lentzeallee 100, D-14195 Berlin, Germany
5Fakultät für Physik, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany
6Atomic and Molecular Physics Laboratories, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian National University, Canberra, ACT 0200, Australia

Received 12 August 1996; published in the issue dated 4 November 1996

Circular dichroism in the double photoionization of He by circularly polarized light has been observed in an angle resolved coincidence experiment at 93.5 eV photon energy. The use of a transmission multilayer, which acts as a quarter-wave plate for the linearly polarized incident light, together with time-of-flight spectrometers, which enable simultaneous detection of all electron pairs, has made the measurements possible. The results show strong dependence of the dichroism on the relative emission angles and the energy sharing between the ejected electrons in good agreement with our numerical calculations.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.3975
DOI:
10.1103/PhysRevLett.77.3975
PACS:
32.80.Fb, 33.55.Ad
 
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