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2006 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, p. 043002-Article in journal (Refereed) Published
Abstract [en]
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.
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-94517 (URN)10.1103/PhysRevLett.96.043002 (DOI)
2006-05-052006-05-052017-12-14Bibliographically approved