Double photoexcitation of helium in a strong dc electric field

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 k...

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Bibliographic Details
Published in:Physical review letters 2003-04, Vol.90 (13), p.133002-133002, Article 133002
Main Authors: Harries, James R, Sullivan, James P, Sternberg, James B, Obara, Satoshi, Suzuki, Tadayuki, Hammond, Peter, Bozek, John, Berrah, Nora, Halka, Monica, Azuma, Yoshiro
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.90.133002