arXiv:0807.4397

High-Precision Measurement of the Laser-Trapping Frequencies for $^{209,210,211}$Fr Atoms

Sanguinetti, S., R. Calabrese, L. Corradi, A. Dainelli, Alen Khanbekyan, E. Mariotti, C. de Mauro, P. Minguzzi, L. Moi, G. Stancari, L. Tomassetti, Stefano Veronesi

Published Jul 28, 2008• 4 citations

arXiv HTML PDF

Abstract

We present the accurate measurement of the frequency of the $7S-7P$ laser-trapping transition for three francium isotopes. Our approach is based on an interferometric comparison to deduce the unknown laser frequency from a secondary laser frequency-standard. After careful investigation of systematics, with samples of about 100 atoms the final accuracy reaches 8 MHz, an order of magnitude better than the best previous measurement for $^{210}$Fr, and opens the way to improved tests of the theoretical computation of Fr atomic structure.

DOI: 10.48550/arxiv.0807.4397

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arXiv:0807.4397

High-Precision Measurement of the Laser-Trapping Frequencies for $^{209,210,211}$ Fr AtomsHigh-Precision Measurement of the Laser-Trapping Frequencies for $^{209,210,211}$Fr Atoms

Sanguinetti, S., R. Calabrese, L. Corradi, A. Dainelli, Alen Khanbekyan, E. Mariotti, C. de Mauro, P. Minguzzi, L. Moi, G. Stancari, L. Tomassetti, Stefano Veronesi

Published Jul 28, 2008• 4 citations

arXiv HTML PDF

Abstract

We present the accurate measurement of the frequency of the

7S-7P

laser-trapping transition for three francium isotopes. Our approach is based on an interferometric comparison to deduce the unknown laser frequency from a secondary laser frequency-standard. After careful investigation of systematics, with samples of about 100 atoms the final accuracy reaches 8 MHz, an order of magnitude better than the best previous measurement for

^{210}

Fr, and opens the way to improved tests of the theoretical computation of Fr atomic structure.

DOI: 10.48550/arxiv.0807.4397

Related papers

Laser resonance photoionization spectroscopy of Rydberg levels in Fr

С. В. Андреев, Vladilen S Letokhov, V.I. Mishin

We investigated for the first time the high-lying Rydberg levels in the rare radioactive element francium (Fr). The investigations were conducted by the highly sensitive laser resonance atomic photoionization technique with Fr atoms produced at a rate of about ${10}^{3}$ atoms/s in a hot cavity. We measured the wave numbers of the 7 ${p}^{2}$ ${P}_{3/2}$ \ensuremath{\rightarrow} ${\mathrm{nd}}^{2}$ D (n=22--33) and 7 ${p}^{2}$ ${P}_{3/2}$ \ensuremath{\rightarrow} ${\mathrm{ns}}^{2}$ S (n=23, 25--27,29--31) transitions and found the binding energy of the 7 ${p}^{2}$ ${P}_{3/2}$ state to be T=-18 924.8(3) ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, which made it possible to establish accurately the ionization potential of Fr.We investigated for the first time the high-lying Rydberg levels in the rare radioactive element francium (Fr). The investigations were conducted by the highly sensitive laser resonance atomic photoionization technique with Fr atoms produced at a rate of about ${10}^{3}$ atoms/s in a hot cavity. We measured the wave numbers of the 7${p}^{2}$${P}_{3/2}$\ensuremath{\rightarrow}${\mathrm{nd}}^{2}$D (n=22--33) and 7${p}^{2}$${P}_{3/2}$\ensuremath{\rightarrow}${\mathrm{ns}}^{2}$S (n=23, 25--27,29--31) transitions and found the binding energy of the 7${p}^{2}$${P}_{3/2}$ state to be T=-18 924.8(3) ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, which made it possible to establish accurately the ionization potential of Fr.

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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

High-Precision Measurement of the Laser-Trapping Frequencies for

^{209,210,211}

Fr Atoms

We present the accurate measurement of the frequency of the

7S-7P

^{210}

Fr, and opens the way to improved tests of the theoretical computation of Fr atomic structure.

{10}^{3}

atoms/s in a hot cavity. We measured the wave numbers of the 7

{p}^{2}

{P}_{3/2}

\ensuremath{\rightarrow}

{\mathrm{nd}}^{2}

D (n=22--33) and 7

{p}^{2}

{P}_{3/2}

\ensuremath{\rightarrow}

{\mathrm{ns}}^{2}

S (n=23, 25--27,29--31) transitions and found the binding energy of the 7

{p}^{2}

{P}_{3/2}

state to be T=-18 924.8(3) ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, which made it possible to establish accurately the ionization potential of Fr.

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 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.