E. V. Baklanov, P. V. Pokasov, A. V. Taichenachev, “Precision measurement of the forbidden 21S0 – 23S1 transition frequency in a helium atom”, Kvantovaya Elektronika, 2018, Volume 48, Number 5,Pages 464

This article is cited in 1 paper

Special issue 'Physics of ultracold atoms and their applications'

Precision measurement of the forbidden 2¹S₀ – 2³S₁ transition frequency in a helium atom

E. V. Baklanov^ab, P. V. Pokasov^a, A. V. Taichenachev^ab

^a Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk
^b Novosibirsk State University

Abstract: We demonstrate the possibility of measuring the forbidden 2¹S₀ – 2³S₁ transition frequency (λ = 1557 nm) of a helium atom by the method of stimulated Raman scattering through the intermediate 2³P₁ level. Singlet (2¹S₀) and triplet (2³S₁) 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.

Keywords: lasers, spectroscopy, helium atom, singlet and triplet levels, forbidden transition, frequency standard.

Received: 08.11.2017
Revised: 12.01.2018