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EnglishA 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.
http://hdl.handle.net/11573/66999| Titolo: | Double excitations of helium in weak static electric fields |
| Autori interni: | STRANGES, Stefano |
| Data di pubblicazione: | 2006 |
| Rivista: | PHYSICAL REVIEW LETTERS |
| Abstract: | 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. |
| Handle: | http://hdl.handle.net/11573/66999 |
| Appare nelle tipologie: | 01.a Pubblicazione su Rivista |
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