Observation of New Rydberg Series and Resonances in Doubly Excited Helium at Ultrahigh Resolution

K. Schulz, G. Kaindl, M. Domke, J. D. Bozek, P. A. Heimann, A. S. Schlachter, and J. M. Rost
Phys. Rev. Lett. 77, 3086 – Published 7 October 1996
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Abstract

We report on a striking improvement in spectral resolution in the soft x-ray range to 1.0 meV at 64.1 eV, measured via the μeV-wide 2, 13 double-excitation resonance of helium. This ultrahigh resolution combined with the high photon flux at undulator beam line 9.0.1 of the Advanced Light Source have allowed observation of new Rydberg series and resonances below the N=3 threshold of doubly excited He. The obtained resonance parameters (energies, lifetime widths, and Fano-q parameters) are in excellent agreement with the results of state-of-the-art calculations.

  • Received 18 April 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.3086

©1996 American Physical Society

Authors & Affiliations

K. Schulz, G. Kaindl, and M. Domke

  • Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin-Dahlem, Germany

J. D. Bozek, P. A. Heimann, and A. S. Schlachter

  • Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720

J. M. Rost

  • Fakultät für Physik, Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany

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Vol. 77, Iss. 15 — 7 October 1996

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