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Physical Review A

Measurements of spontaneous-emission rates in atomic thallium

L. R. Hunter, Eugene D. Commins, L. Roesch

Published Feb 1, 1982• 14 citations

Abstract

We report measurements of the following spontaneous-emission rates in atomic thallium: $A(6{D}_{\frac{3}{2}}\ensuremath{-}7{P}_{\frac{1}{2}})=(5.97\ifmmode\pm\else\textpm\fi{}0.78)\ifmmode\times\else\texttimes\fi{}{10}^{5}{\mathrm{s}}^{\ensuremath{-}1}$, $A(7{P}_{\frac{1}{2}}\ensuremath{-}7{S}_{\frac{1}{2}})=(1.71\ifmmode\pm\else\textpm\fi{}0.07)\ifmmode\times\else\texttimes\fi{}{10}^{7}{\mathrm{s}}^{\ensuremath{-}1}$, $A(7{P}_{\frac{3}{2}}\ensuremath{-}7{S}_{\frac{1}{2}})=(2.37\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{7}{\mathrm{s}}^{\ensuremath{-}1}$, and $A(8{P}_{\frac{3}{2}}\ensuremath{\rightarrow}\mathrm{all})=(9.2\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{6}{\mathrm{s}}^{\ensuremath{-}1}$. These results are compared to predictions of theoretical models and lend support to calculations of the recently measured parity-nonconserving circular dichroism of the $6{P}_{\frac{1}{2}}\ensuremath{-}7{P}_{\frac{1}{2}}$ forbidden $M1$ transition in thallium.

DOI: 10.1103/physreva.25.885

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Motivated by the potential use of electromagnetically induced transparency (EIT) to measure atomic parity nonconservation (PNC), we have studied EIT and associated optical rotation for a three-level system in thallium vapor. EIT allows sub-Doppler resolution of the ${6P}_{1/2}\ensuremath{\rightarrow}{6P}_{3/2}$ mixed magnetic dipole, electric quadrupole transition at $1.28\ensuremath{\mu}\mathrm{m}$ when $0.535\ensuremath{-}\ensuremath{\mu}\mathrm{m}$ radiation acts on the ${6P}_{3/2}\ensuremath{\rightarrow}{7S}_{1/2}$ transition. Our measurements include rotation due to electromagnetically induced birefringence and Faraday rotation perturbed by EIT. We also identify a new method for determining the amplitude ratio $E2/M1$ for the $1.28\ensuremath{-}\ensuremath{\mu}\mathrm{m}$ transition. The possible advantages of an EIT technique for measuring atomic PNC are discussed in the context of our results.

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Measurement of Stark Amplitudes in the 6 2P1/2 ---> 7 2P1/2 Transition of Atomic Thallium

Carol E. Tanner

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We report measurements of the following spontaneous-emission rates in atomic thallium:

A(6{D}_{\frac{3}{2}}\ensuremath{-}7{P}_{\frac{1}{2}})=(5.97\ifmmode\pm\else\textpm\fi{}0.78)\ifmmode\times\else\texttimes\fi{}{10}^{5}{\mathrm{s}}^{\ensuremath{-}1}

,

A(7{P}_{\frac{1}{2}}\ensuremath{-}7{S}_{\frac{1}{2}})=(1.71\ifmmode\pm\else\textpm\fi{}0.07)\ifmmode\times\else\texttimes\fi{}{10}^{7}{\mathrm{s}}^{\ensuremath{-}1}

,

A(7{P}_{\frac{3}{2}}\ensuremath{-}7{S}_{\frac{1}{2}})=(2.37\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{7}{\mathrm{s}}^{\ensuremath{-}1}

, and

A(8{P}_{\frac{3}{2}}\ensuremath{\rightarrow}\mathrm{all})=(9.2\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{6}{\mathrm{s}}^{\ensuremath{-}1}

. These results are compared to predictions of theoretical models and lend support to calculations of the recently measured parity-nonconserving circular dichroism of the

6{P}_{\frac{1}{2}}\ensuremath{-}7{P}_{\frac{1}{2}}

forbidden

M1

transition in thallium.

Observation of the forbidden 2

sup 3

S

sub 1

Yields

1

sup 1

S

sub 0

spontaneous emission line from helium and measurement of the transition rate

Motivated by the potential use of electromagnetically induced transparency (EIT) to measure atomic parity nonconservation (PNC), we have studied EIT and associated optical rotation for a three-level system in thallium vapor. EIT allows sub-Doppler resolution of the ${6P}_{1/2}\ensuremath{\rightarrow}{6P}_{3/2}$ mixed magnetic dipole, electric quadrupole transition at $1.28\ensuremath{\mu}\mathrm{m}$ when $0.535\ensuremath{-}\ensuremath{\mu}\mathrm{m}$ radiation acts on the ${6P}_{3/2}\ensuremath{\rightarrow}{7S}_{1/2}$ transition. Our measurements include rotation due to electromagnetically induced birefringence and Faraday rotation perturbed by EIT. We also identify a new method for determining the amplitude ratio

E2/M1

for the $1.28\ensuremath{-}\ensuremath{\mu}\mathrm{m}$ transition. The possible advantages of an EIT technique for measuring atomic PNC are discussed in the context of our results.