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Precision measurement of the forbidden 2 1 S 0 – 2 3 S 1 transition frequency in a helium atom

Research paper by E V Baklanov, P V Pokasov A V Taichenachev

Indexed on: 01 Jun '18Published on: 28 May '18Published in: Quantum electronics



Abstract

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.