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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

Tensor polarizability measurement by a quantum beat method