Double Excitations of Helium in Weak Static Electric Fields

A dramatic electric field dependence has been observed in the fluorescence yield spectrum of the doubly excited states in helium, where a rich phenomenology is encountered below the N=2 threshold. Fluorescence yields of certain states can be tuned to zero, while other dipole-forbidden states are sig...

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Bibliographic Details
Published in:	Physical review letters Vol. 96; no. 4
Main Authors:	Saathe, Conny, Stroem, Magnus, Aga ring ker, Marcus, Soederstroem, Johan, Rubensson, Jan-Erik, Richter, Robert, Alagia, Michele, Stranges, Stefano, Gorczyca, T.W., Robicheaux, F.
Format:	Journal Article
Language:	English
Published:	United States 03-02-2006
Subjects:	CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DIPOLES ELECTRIC FIELDS ELECTROLUMINESCENCE EXCITATION EXCITED STATES FLUORESCENCE HELIUM R MATRIX
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Summary:	A dramatic electric field dependence has been observed in the fluorescence yield spectrum of the doubly excited states in helium, where a rich phenomenology is encountered below the N=2 threshold. Fluorescence yields of certain states can be tuned to zero, while other dipole-forbidden states are significantly enhanced, for fields much weaker than 1 kV/cm. Using an R-matrix multichannel quantum defect theory, spherical-to-parabolic frame transformation method, we are able to reproduce the main features of the observed spectrum, and we discuss the qualitative behavior in terms of weak electric field mixing.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PHYSREVLETT.96.0