Tensor polarizability of the $2 {}^{1}P_{1}$ state of ${He}^{4}$ by electric-field level crossing

1 November 1974

journal article
research article
Published by American Physical Society (APS) in Physical Review A

Vol. 10 (5) , 1685-1699
https://doi.org/10.1103/physreva.10.1685

Abstract

A measurement of the tensor polarizability of the

2 {}^{1}P_{1}

state of atomic helium has been made by the electric-field level-crossing technique using an atomic-beam apparatus. The experimental procedure is as follows: An atomic beam containing metastable

2 {}^{1}S_{0}

and

2 {}^{3}S_{1}

helium atoms is produced by electron bombardment of ground-state helium atoms. The beam then passes through a region in which the atoms are subjected to a uniform, variable electric field. In this region the

2 {}^{1}S_{0}

atoms are excited to the

2 {}^{1}P_{1}

state by linearly polarized 20 582-Å (

2 {}^{1}S_{0} - 2 {}^{1}P_{1}

) resonance radiation. The extreme uv photons emitted in the direction of the incident resonance light when the

2 {}^{1}P_{1}

state decays to the ground state are counted. The sum intensity of the 584-Å (

2 {}^{1}P_{1} - 1 {}^{1}S_{0}

) photons and the 601-Å (

2 {}^{1}S_{0} - 1 {}^{1}S_{0}

) photons, due to the electric-field quenching of the

2 {}^{1}S_{0}

atoms, is measured as a function of the applied electric field for the incident light polarized at 45° and 90° to the direction of the static electric field. From these measurements the tensor polarizability

α_{2} (2 {}^{1}P_{1})

of the

2 {}^{1}P_{1}

state is found to be (3.32 ± 0.10) ×

10^{- 23}

Keywords

This publication has 29 references indexed in Scilit:

Stark Effect in the Excited States of Rb, Cs, Cd, and Hg
Physical Review B, 1968
Oscillator Strengths for Singlet and Triplet Series in Neutral Helium
The Astrophysical Journal, 1966
$2 {}^{1, 3}P$ , $3 {}^{1, 3}P$ , and $4 {}^{1, 3}P$ States of He and the $2 {}^{1}P$ State of ${Li}^{+}$
Physical Review B, 1965
Wave Functions for the Excited States of Neutral Helium
Physical Review B, 1965
$f$ Values for Transitions between the $1 {}^{1}S$ , $2 {}^{1}S$ , and $2 {}^{3}S$ , and the $2 {}^{1}P$ , $2 {}^{3}P$ , $3 {}^{1}P$ , and $3 {}^{3}P$ States in Helium
Physical Review B, 1964
Excited $S$ States of Helium
Physical Review B, 1962
$1 {}^{1}S$ , $2 {}^{1}S$ , and $2 {}^{3}S$ States of $H^{-}$ and of He
Physical Review B, 1962
Properties of the Metastable Helium Atoms
Proceedings of the Physical Society, 1958
Properties of the Helium Atom
Proceedings of the Physical Society. Section A, 1957
Quantum Theory of Dispersion (Continued). Parts VI and VII
Reviews of Modern Physics, 1933

Tensor polarizability of the2 P11state ofHe4by electric-field level crossing

Abstract

Keywords

Tensor polarizability of the $2 {}^{1}P_{1}$ state of ${He}^{4}$ by electric-field level crossing