Optics and Spectroscopy

Precision Measurements of Forbidden Transition Frequencies Using Stimulated Raman Scattering

E. V. Baklanov, Sergey M Kobtsev, А. В. Тайченачев

Published Nov 1, 2018• 0 citations

Abstract

Abstract The possibility of precision measurements of frequencies of forbidden transitions of cold atoms in a trap using stimulated Raman scattering is shown. Transition 1S–2S in a hydrogen atom, in which the atom passes from level 1S to level 2S via intermediate level 3P is considered in detail. In this case, the frequency of the pump field (103 nm) is close to the frequency of the 3P–1S transition, while the stimulated scattering frequency (656 nm) is close to the frequency of the 3P–2S transition.

DOI: 10.1134/s0030400x18110061

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Optics and Spectroscopy

Precision Measurements of Forbidden Transition Frequencies Using Stimulated Raman Scattering

E. V. Baklanov, Sergey M Kobtsev, А. В. Тайченачев

Published Nov 1, 2018• 0 citations

Publisher

Abstract

DOI: 10.1134/s0030400x18110061

Related papers

About measuring the forbidden 1S-2S transition frequency of a hydrogen atom by stimulated Raman scattering

E. V. Baklanov, Sergey M Kobtsev, А. В. Тайченачев

AIP conference proceedingsJan 1, 20190 citations

On the measurement of forbidden 21S0 – 23S1 transition frequency in helium by the method of stimulated Raman scattering

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

AIP conference proceedingsJan 1, 20190 citations

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

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

Quantum ElectronicsMay 7, 20181 citation

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

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We have observed the cold collision frequency shift of the $1S$ - $2S$ transition in trapped spin-polarized atomic hydrogen. We find $\ensuremath{\Delta}{\ensuremath{\nu}}_{1S\ensuremath{-}2S}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}3.8\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}n\mathrm{Hz}{\mathrm{cm}}^{3}$, where $n$ is the sample density. From this we derive the $1S$ - $2S$ $s$ -wave triplet scattering length, ${a}_{1S\ensuremath{-}2S}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}1.4\ifmmode\pm\else\textpm\fi{}0.3\mathrm{nm}$, which is in fair agreement with a recent calculation. The shift provides a valuable probe of the distribution of densities in a trapped sample.We have observed the cold collision frequency shift of the $1S$- $2S$ transition in trapped spin-polarized atomic hydrogen. We find $\ensuremath{\Delta}{\ensuremath{\nu}}_{1S\ensuremath{-}2S}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}3.8\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}n\mathrm{Hz}{\mathrm{cm}}^{3}$, where $n$ is the sample density. From this we derive the $1S$- $2S$ $s$-wave triplet scattering length, ${a}_{1S\ensuremath{-}2S}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}1.4\ifmmode\pm\else\textpm\fi{}0.3\mathrm{nm}$, which is in fair agreement with a recent calculation. The shift provides a valuable probe of the distribution of densities in a trapped sample.

arXiv:physics/9809016Physical Review LettersNov 2, 1998172 citations

Resonant stimulated Raman scattering (SRS) from the

{{2}^{3}}S{-} {{1}^{1}}S

forbidden transition in a helium atom (62.6 nm) via the intermediate

{{2}^{3}}{{P}_{1}}

level has been considered. The metastable

{{2}^{3}}S

state has the lowest energy in the triplet spectral region (He*), and the ground state is

{{1}^{1}}S

. The reduced kinetic equations for the density matrix, which are used to analyze the SRS resonance, have been derived. The expressions for the field broadening and resonance shift are obtained, the Doppler broadening is taken into account, and numerical estimations are performed.

We have observed the cold collision frequency shift of the

1S

2S

transition in trapped spin-polarized atomic hydrogen. We find $\ensuremath{\Delta}{\ensuremath{\nu}}_{1S\ensuremath{-}2S}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}3.8\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}n\mathrm{Hz}{\mathrm{cm}}^{3}$, where

n

is the sample density. From this we derive the

1S

2S

s

-wave triplet scattering length, ${a}_{1S\ensuremath{-}2S}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}1.4\ifmmode\pm\else\textpm\fi{}0.3\mathrm{nm}$, which is in fair agreement with a recent calculation. The shift provides a valuable probe of the distribution of densities in a trapped sample.