Tensor polarizability measurement by a quantum beat method

Abstract

2014 Une orientation électronique est produite par effet Stark du second ordre en appliquant un champ électrique sur des niveaux atomiques excités et alignés au préalable par interaction faisceaufeuille. On mesure les fréquences de modulation en alignement et en orientation dans l'hélium en fonction du champ électrique appliqué. On en déduit les polarisabilités tensorielles des niveaux n 1D de l'hélium (n = 3, 4, 5), que l'on compare aux valeurs théoriques. Abstract. 2014 Electronic orientation is produced via second order Stark effect by applying an oblique electric field on excited atomic levels previously aligned by beam-foil interaction. Frequencies of alignment and orientation modulations are measured in helium as a function of the applied electric field strength. The deduced tensor polarizabilities of the 4He (n 1D, n = 3, 4, 5) levels are compared with theoretical values.

Hyperfine structure evolution in an electric field and determination of tensor polarizabilities in He (4 and 5 1D)

“…In table III our present results are compared with theoretical and other experimental values. Previous beam-foil data were obtained in 4He using different geometries [17,18]. The level-crossing data of Szostak et al [19] are also available for comparison.…”