arXiv:physics/0502090 · Physical Review A

Lifetime measurement of the 6s level of rubidium

E. Gómez, F. Baumer, A. D. Lange, Gene D. Sprouse, Luis A. Orozco

Published Jul 1, 2005• 31 citations

Abstract

We present a lifetime measurement of the $6s$ level of rubidium. We use a time-correlated single-photon counting technique on two different samples of rubidium atoms, a vapor cell with variable rubidium density, and a sample of atoms confined and cooled in a magneto-optical trap. The $5{P}_{1∕2}$ level serves as the resonant intermediate step for the two-step excitation to the $6s$ level. We detect the decay of the $6s$ level through the cascade fluorescence of the $5{P}_{3∕2}$ level at 780 nm. The two samples have different systematic effects, but we obtain consistent results that averaged give a lifetime of $45.57\ifmmode\pm\else\textpm\fi{}0.17\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$.

DOI: 10.1103/physreva.72.012502

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Lifetime measurements of the 7D levels of atomic francium

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Lifetime measurement of the 9s level of atomic francium

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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.

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Lifetime of the 7s6d D12 atomic state of radium

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arXiv:physics/0502090 · Physical Review A

Lifetime measurement of the 6s level of rubidium

E. Gómez, F. Baumer, A. D. Lange, Gene D. Sprouse, Luis A. Orozco

Published Jul 1, 2005• 31 citations

arXiv HTML PDF

Abstract

We present a lifetime measurement of the

6s

level of rubidium. We use a time-correlated single-photon counting technique on two different samples of rubidium atoms, a vapor cell with variable rubidium density, and a sample of atoms confined and cooled in a magneto-optical trap. The

5{P}_{1∕2}

level serves as the resonant intermediate step for the two-step excitation to the

6s

level. We detect the decay of the

6s

level through the cascade fluorescence of the

5{P}_{3∕2}

level at 780 nm. The two samples have different systematic effects, but we obtain consistent results that averaged give a lifetime of

45.57\ifmmode\pm\else\textpm\fi{}0.17\phantom{\rule{0.3em}{0ex}}\mathrm{ns}

DOI: 10.1103/physreva.72.012502

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Lifetime measurement of the 8s level in francium

E. Gómez, Luis A. Orozco, A. Pérez Galván +1 more

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 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.

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

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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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Lifetime of the 7s6d D12 atomic state of radium

William L. Trimble, Ibrahim Sulai, Irshad Ahmad +8 more

The lifetime of the $7s6d$ ${^{1}D}_{2}$ state of atomic radium is determined to be $385(45)\text{ }\ensuremath{\mu}\text{s}$ using cold $^{226}\text{R}\text{a}$ atoms prepared in a magneto-optical trap. The ${^{1}D}_{2}$ state is populated from the decay of the ${^{1}P}_{1}$ state which is excited by a pulse of 483 nm light. The decay of the ${^{1}D}_{2}$ state is observed by detecting delayed fluorescence at 714 nm from the last step in the decay sequence ${^{1}P}_{1}\text{\ensuremath{-}}{^{1}D}_{2}\text{\ensuremath{-}}{^{3}P}_{1}\text{\ensuremath{-}}{^{1}S}_{0}$. The measured lifetime is compared to a number of theoretical calculations. An improved value of the $7s7p$ ${^{1}P}_{1}$ level of $20\text{ }715.598(6)\text{ }{\text{cm}}^{\ensuremath{-}1}$ is obtained.The lifetime of the $7s6d$ ${^{1}D}_{2}$ state of atomic radium is determined to be $385(45)\text{ }\ensuremath{\mu}\text{s}$ using cold $^{226}\text{R}\text{a}$ atoms prepared in a magneto-optical trap. The ${^{1}D}_{2}$ state is populated from the decay of the ${^{1}P}_{1}$ state which is excited by a pulse of 483 nm light. The decay of the ${^{1}D}_{2}$ state is observed by detecting delayed fluorescence at 714 nm from the last step in the decay sequence ${^{1}P}_{1}\text{\ensuremath{-}}{^{1}D}_{2}\text{\ensuremath{-}}{^{3}P}_{1}\text{\ensuremath{-}}{^{1}S}_{0}$. The measured lifetime is compared to a number of theoretical calculations. An improved value of the $7s7p$ ${^{1}P}_{1}$ level of $20\text{ }715.598(6)\text{ }{\text{cm}}^{\ensuremath{-}1}$ is obtained.

Physical Review ANov 10, 200913 citations

We present a lifetime measurement of the

6s

5{P}_{1∕2}

level serves as the resonant intermediate step for the two-step excitation to the

6s

level. We detect the decay of the

6s

level through the cascade fluorescence of the

5{P}_{3∕2}

level at 780 nm. The two samples have different systematic effects, but we obtain consistent results that averaged give a lifetime of

45.57\ifmmode\pm\else\textpm\fi{}0.17\phantom{\rule{0.3em}{0ex}}\mathrm{ns}

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 lifetime measurements of the

5{D}_{3∕2}

and

5{D}_{5∕2}

states of rubidium using the time-correlated single-photon-counting method. We perform the experiment in a magneto-optical trap of

^{87}\mathrm{Rb}

atoms using a two-step excitation with the trap laser at

780\phantom{\rule{0.3em}{0ex}}\mathrm{nm}

as the first step. We record the

761.9\phantom{\rule{0.3em}{0ex}}\mathrm{nm}

fluorescence from the decay of the

5{D}_{3∕2}

state to the

5{P}_{1∕2}

state, and measure the lifetime of the

5{D}_{3∕2}

state $\ensuremath{\tau}=246.3(1.6)\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$. We record the

420.2\phantom{\rule{0.3em}{0ex}}\mathrm{nm}

fluorescence from the cascade decay of the

5{D}_{5∕2}

state to the

5{S}_{1∕2}

state through the

6{P}_{3∕2}

state, and extract the lifetime of the

5{D}_{5∕2}

state $\ensuremath{\tau}=238.5(2.3)\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$.

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.

The lifetime of the

7s6d

{^{1}D}_{2}

state of atomic radium is determined to be $385(45)\text{ }\ensuremath{\mu}\text{s}$ using cold

^{226}\text{R}\text{a}

atoms prepared in a magneto-optical trap. The

{^{1}D}_{2}

state is populated from the decay of the

{^{1}P}_{1}

state which is excited by a pulse of 483 nm light. The decay of the

{^{1}D}_{2}

state is observed by detecting delayed fluorescence at 714 nm from the last step in the decay sequence ${^{1}P}_{1}\text{\ensuremath{-}}{^{1}D}_{2}\text{\ensuremath{-}}{^{3}P}_{1}\text{\ensuremath{-}}{^{1}S}_{0}$. The measured lifetime is compared to a number of theoretical calculations. An improved value of the

7s7p

{^{1}P}_{1}

level of $20\text{ }715.598(6)\text{ }{\text{cm}}^{\ensuremath{-}1}$ is obtained.