Optics Letters

Lifetime measurement of the 9s level of atomic francium

S. Aubin, E. Gómez, Luis A. Orozco, Gene D. Sprouse

Published Nov 1, 2003• 12 citations

Abstract

We use two-photon resonant excitation and time-correlated single-photon counting techniques on a sample of 210Fr atoms confined and cooled in a magneto-optical trap to measure the lifetime of the 9s excited level. Direct measurement of the decay through the 7P(3/2) level at 851 nm yields a lifetime of 107.53 +/- 0.80 ns.

DOI: 10.1364/ol.28.002055

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Optics Letters

Lifetime measurement of the 9s level of atomic francium

S. Aubin, E. Gómez, Luis A. Orozco, Gene D. Sprouse

Published Nov 1, 2003• 12 citations

Publisher

Abstract

DOI: 10.1364/ol.28.002055

Related papers

Lifetimes of the 9s and 8p levels of atomic francium

S. Aubin, E. Gómez, Luis A. Orozco +1 more

We use time-correlated single-photon counting techniques on a sample of $^{210}\mathrm{Fr}$ atoms confined and cooled in a magneto-optical trap to measure the lifetimes of the $9{S}_{1∕2},\phantom{\rule{0.3em}{0ex}}8{P}_{3∕2}$ , and $8{P}_{1∕2}$ excited levels. We populate the $9{S}_{1∕2}$ level by two-photon resonant excitation through the $7{P}_{1∕2}$ level. The direct measurement of the $9{S}_{1∕2}$ decay through the $7{P}_{3∕2}$ level at 851 nm gives a lifetime of $107.53\ifmmode\pm\else\textpm\fi{}0.90\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$. We observe the decay of the $9{S}_{1∕2}$ level through the $8{P}_{3∕2}$ level at 423 nm and the $8{P}_{1∕2}$ level at 433 nm down to the $7{S}_{1∕2}$ ground level, and indirectly determine the lifetimes of these to be $83.5\ifmmode\pm\else\textpm\fi{}1.5\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$ and $149.3\ifmmode\pm\else\textpm\fi{}3.5\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$, respectively.We use time-correlated single-photon counting techniques on a sample of $^{210}\mathrm{Fr}$ atoms confined and cooled in a magneto-optical trap to measure the lifetimes of the $9{S}_{1∕2},\phantom{\rule{0.3em}{0ex}}8{P}_{3∕2}$, and $8{P}_{1∕2}$ excited levels. We populate the $9{S}_{1∕2}$ level by two-photon resonant excitation through the $7{P}_{1∕2}$ level. The direct measurement of the $9{S}_{1∕2}$ decay through the $7{P}_{3∕2}$ level at 851 nm gives a lifetime of $107.53\ifmmode\pm\else\textpm\fi{}0.90\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$. We observe the decay of the $9{S}_{1∕2}$ level through the $8{P}_{3∕2}$ level at 423 nm and the $8{P}_{1∕2}$ level at 433 nm down to the $7{S}_{1∕2}$ ground level, and indirectly determine the lifetimes of these to be $83.5\ifmmode\pm\else\textpm\fi{}1.5\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$ and $149.3\ifmmode\pm\else\textpm\fi{}3.5\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$, respectively.

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We present the first measurement of an atomic radiative lifetime in Fr. We use a time-correlated single photon counting technique with a cold sample of ${}^{210}\mathrm{Fr}$ atoms in a magneto-optic trap. The results are a precision experimental test of the atomic many-body perturbation theory applied to the heaviest alkali. The lifetime for the $7p{}^{2}{P}_{3/2}$ level of $21.02(16)$ ns gives a value for the reduced transition matrix element between the levels $7s{}^{2}{S}_{1/2}\ensuremath{\rightarrow}7p{}^{2}{P}_{3/2}$ of $5.898(22){a}_{\ensuremath{\infty}}$ atomic units.We present the first measurement of an atomic radiative lifetime in Fr. We use a time-correlated single photon counting technique with a cold sample of ${}^{210}\mathrm{Fr}$ atoms in a magneto-optic trap. The results are a precision experimental test of the atomic many-body perturbation theory applied to the heaviest alkali. The lifetime for the $7p{}^{2}{P}_{3/2}$ level of $21.02(16)$ ns gives a value for the reduced transition matrix element between the levels $7s{}^{2}{S}_{1/2}\ensuremath{\rightarrow}7p{}^{2}{P}_{3/2}$ of $5.898(22){a}_{\ensuremath{\infty}}$ atomic units.

Physical Review LettersJun 2, 199732 citations

We use time-correlated single-photon counting techniques on a sample of

^{210}\mathrm{Fr}

atoms confined and cooled in a magneto-optical trap to measure the lifetimes of the

9{S}_{1∕2},\phantom{\rule{0.3em}{0ex}}8{P}_{3∕2}

, and

8{P}_{1∕2}

excited levels. We populate the

9{S}_{1∕2}

level by two-photon resonant excitation through the

7{P}_{1∕2}

level. The direct measurement of the

9{S}_{1∕2}

decay through the

7{P}_{3∕2}

level at 851 nm gives a lifetime of $107.53\ifmmode\pm\else\textpm\fi{}0.90\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$. We observe the decay of the

9{S}_{1∕2}

level through the

8{P}_{3∕2}

level at 423 nm and the

8{P}_{1∕2}

level at 433 nm down to the

7{S}_{1∕2}

ground level, and indirectly determine the lifetimes of these to be $83.5\ifmmode\pm\else\textpm\fi{}1.5\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$ and $149.3\ifmmode\pm\else\textpm\fi{}3.5\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$, respectively.

We present lifetime measurements of the

{7D}_{3/2}

and

{7D}_{5/2}

levels of Fr. We use a time-correlated single-photon counting technique on a sample of

{}^{210}\mathrm{Fr}

atoms confined and cooled in a magneto-optical trap. The upper state of the

{7P}_{3/2}

trapping transition serves as the resonant intermediate level for two-photon excitation of the

7D

states. A probe laser provides the second step of the excitation, and we detect the decay of the atomic fluorescence. Our measurements help extend the knowledge of this class of atomic wave functions in which correlation effects are very significant. We measure lifetimes of $73.6\ifmmode\pm\else\textpm\fi{}0.3 \mathrm{ns}$ and $67.7\ifmmode\pm\else\textpm\fi{}2.9 \mathrm{ns}$ for the

{7D}_{3/2}

and

{7D}_{5/2}

levels, respectively.

We present lifetime measurements of the

{7p}^{2}{P}_{3/2}

and

{7p}^{2}{P}_{1/2}

levels of Fr. We use a time-correlated single-photon counting technique on a cold sample of

{}^{210}\mathrm{Fr}

atoms in a magneto-optic trap. We excite the atoms with the trapping and repumping beams of the magneto-optic trap and detect the decay of the atomic fluorescence. The results are a precision experimental test of the atomic many-body perturbation theory applied to the heaviest alkali metal. The lifetime results are 21.02(11) ns and 29.45(11) ns for the

{7p}^{2}{P}_{3/2}

and

{7p}^{2}{P}_{1/2}

levels, respectively. This gives a line strength ratio

{\mathcal{S}}_{1/2}

{\mathcal{S}}_{3/2}

of 0.526(3) for these levels in Fr. To study sources of systematic errors we measure the lifetimes of

{5p}^{2}{P}_{3/2}

and

{5p}^{2}{P}_{1/2}

in stable

{}^{87}\mathrm{Rb}

and obtain 26.20(9) ns and 27.64(4) ns, respectively.

We measure the lifetime of the

8s

level of

^{210}\mathrm{Fr}

atoms on a magneto-optically trapped sample with time-correlated single-photon counting. The

7{P}_{1∕2}

state serves as the resonant intermediate level for two-step excitation of the

8s

level completed with a $1.3\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$ laser. Analysis of the fluorescence decay through the

7{P}_{3∕2}

level gives $53.30\ifmmode\pm\else\textpm\fi{}0.44\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$ for the

8s

level lifetime.

We present the first measurement of an atomic radiative lifetime in Fr. We use a time-correlated single photon counting technique with a cold sample of

{}^{210}\mathrm{Fr}

atoms in a magneto-optic trap. The results are a precision experimental test of the atomic many-body perturbation theory applied to the heaviest alkali. The lifetime for the

7p{}^{2}{P}_{3/2}

level of

21.02(16)

ns gives a value for the reduced transition matrix element between the levels $7s{}^{2}{S}_{1/2}\ensuremath{\rightarrow}7p{}^{2}{P}_{3/2}$ of $5.898(22){a}_{\ensuremath{\infty}}$ atomic units.