ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Making use of the large tensor polarizabilities of excited He I levels, transitions between Zeeman substates of 1snd 1 D 2 levels have been induced by electric radiofrequency fields after ion-impact excitation of He atoms. Resonance signals have been observed near the Larmor frequencyω=ω L as well as nearω=2ω L . These signals are interpreted as 2-quantum electric-dipole (2E1) transitions and 1E1 transitions, respectively, between the Zeeman sublevels withM=0 andM=±2. The interaction of this 3-state system {¦M〉;M=−2, 0, +2} with the applied external fields (magnetic fieldH z and static and alternating electric fieldℰ=ℰ 0+ℰ 1 cosω t) is discussed. The shape of the resonance signals has been evaluated in the rotating field approximation. In contradiction to the theory, the observed signals show a peculiar narrow structure at the center of the signal which is not yet completely understood. The experimental techniques developed are expected to be useful for investigations of Zeeman-, Stark-, fine and hyperfine splittings of excited He I levels.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01411951
Permalink
