Radiative lifetimes and tensor polarizabilities of 1s4f
1
F and 1s5f
1
F level of He I |
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Authors: | A S Aynacioglu G v Oppen W -D Perschmann D Szostak |
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Institution: | 1. Institut für Strahlungs- und Kernphysik der Technischen Universit?t, Berlin, Germany
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Abstract: | He atoms have been excited by Ne+ ion impact and the depolarization of the fluorescence lines at 668 nm and 492 nm by magnetic and electric fields has been studied. The Ne+ ion energy could be chosen such that pure cascade level crossing signals were observed. From the widths of magnetic depolarization signals the radiative lifetimes τ(1s4f 1 F)=74(2) ns and τ(1s5f 1 F)=133(5) ns have been determined. By investigating the electric field splitting of the magnetic depolarization signals the tensor polarizabilities ¦α ten(1s4f 1 F)¦=0.58(1) kHz/(V/cm)2 and ¦α ten(1s5f 1 F)¦=4.2(1) kHz/(V/cm)2 have been deduced. From the latter value a mean frequencyv(1s5g?1s5f)=14.4 GHz of the transitions between the levels of the 1s5f configuration and those of the 1s5g configuration has been derived.α ten(1s4f 1 F) depends sensitively on the singlet-triplet mixing in the 1s4f configuration and thus a mixing coefficient could be deduced for this configuration. |
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