Electric-field-induced singlet-triplet anticrossings in helium

11 January 1977

journal article
Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics

Vol. 10 (1) , L5-L9
https://doi.org/10.1088/0022-3700/10/1/002

Abstract

Anticrossing signals have been detected between n¹D and n³D states of neutral He (n=5 to 7) using external electric field and internal singlet-triplet perturbations to couple the crossing states. Improved results for the n¹D-n³D intervals are obtained: 34066.3(7.2), 20918.0(9.2) and 13632.8(5.3) MHz for n=5, 6, 7 respectively. This type of anticrossing also allows the study of the differential Stark effect, the anisotropic susceptibility chi _A and the relativistic fine structure of the n³D states.

Keywords

This publication has 15 references indexed in Scilit:

Singlet-triplet anticrossings in ${}^{4}{He}$ . III. Separation and mixing of the $n = 3 - 8 {}^{1}D$ and ${}^{3}D$ states
Physical Review A, 1976
Measurement of the¹D-³D intervals in highly excited states of helium
Journal of Physics B: Atomic and Molecular Physics, 1976
Measurement of the n¹D-n³D intervals in He n=8 to 11
Journal of Physics B: Atomic and Molecular Physics, 1975
Fine structure of Rydberg states: $n = 6 and 7$ $D$ and $F$ states of ${}^{4}{He}$
Physical Review A, 1975
Theoretical study of helium Rydberg states
Physical Review A, 1974
Cascading Anticrossings from $n = 5 {He}^{+}$
Physical Review Letters, 1972
Fine Structure and Diamagnetic Zeeman Effect in He ( $4 {}^{3}P$ )
Physical Review A, 1971
Stark-Mixing Signals in the $n = 4$ term of Singly Ionized Helium
Physical Review Letters, 1969
Observation of a “forbidden” level crossing in the n = 2 state of atomic hydrogen
Physics Letters, 1966
Observation of "Anticrossings" in Optical Resonance Fluorescence
Physical Review Letters, 1963