Double Photoexcitation of Helium in a Strong dc Electric Field

J.R. Harries, J.P. Sullivan, J.B. Sternberg, S. Obara, T. Suzuki, Peter Hammond, J. Bozek, N. Berrah, M. Halka, Y. Azuma

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    Abstract

    We report the first experimental measurements of the effect of an applied field on the photoexcitation and autoionization of doubly excited states of helium. Ground-state photoionization spectra have been measured in the region below the He+ (N = 2) threshold with static electric fields of up to 84.4 kV/cm across the interaction region. The results are compared to the theoretical calculations of Chung et al. [J. Phys. B 34, 165 (2001)], which are the only calculations available in this regime. Transitions to several states in the N = 2, n = 6 manifold are assigned, and a wealth of new structure is observed. Our data show that many more series are mixed in by the field than those predicted by theory.
    Original languageEnglish
    Pages (from-to)133002-1-133002-4
    JournalPhysical Review Letters
    Volume90
    Issue number13
    DOIs
    Publication statusPublished - 2003

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