Precise measurement of electronic gJ value of helium, gJ(4He,23S1)

M. G. Huber, Muhammad Arif, David L. Jacobson +5 more

Srećko Kilić, L. Vranjeˇs

R. Flack, Vincenzo Monachello, Basil J. Hiley +1 more

A method for measuring the weak value of spin for atoms is proposed using a variant of the original Stern-Gerlach apparatus. A full simulation of an experiment for observing the real part of the weak value using the impulsive approximation has been carried out. Our predictions show a displacement of the beam of helium atoms in the metastable 23S1 state, Δw, that is within the resolution of conventional microchannel plate detectors indicating that this type of experiment is feasible. Our analysis also determines the experimental parameters that will give an accurate determination of the weak value of spin. Preliminary experimental results are shown for helium, neon and argon in the 23S1 and 3P2 metastable states, respectively.

J.P.M. Woudenberg, J.M.W. Milatz

Bruce Edward Zundell

E. V. Baklanov, P.V. Pokasov, А. В. Тайченачев

We demonstrate the possibility of measuring the forbidden 2 1 S 0 – 2 3 S 1 transition frequency ( λ = 1557 nm) of a helium atom by the method of stimulated Raman scattering through the intermediate 2 3 P 1 level. Singlet (2 1 S 0 ) and triplet (2 3 S 1 ) states have long lifetimes of 20 ms and 8000 s, respectively. The transition is important for the spectroscopy of the helium atom because it relates the singlet and triplet parts of the spectrum.