Electric dipole matrix elements for the 6p2PJ→7s2S1/2

Abstract

We report a measurement of the ratio of electric dipole transition matrix elements of cesium for the 6p 2 P 1/2 → 7s 2 S 1/2 and 6p 2 P 3/2 → 7s 2 S 1/2 transitions. We determine this ratio of matrix elements through comparisons of two-color, two-photon excitation rates of the 7s 2 S 1/2 state using laser beams with polarizations parallel to one another vs. perpendicular to one another. Our result of R ≡ 7s 2 S 1/2 ||r||6p 2 P 3/2 / 7s 2 S 1/2 ||r||6p 2 P 1/2 = 1.5272 (17) is in excellent agreement with a theoretical prediction of R = 1.5270 (27). Moreover, the accuracy of the experimental ratio is sufficiently high to differentiate between various theoretical approaches. To our knowledge, there are no prior experimental measurements of R. Combined with our recent determination of the lifetime of the 7s 2 S 1/2 state, we determine reduced matrix elements for these two transitions, 7s 2 S 1/2 ||r||6p 2 P 3/2 = −6.489 (5) a0 and 7s 2 S 1/2 ||r||6p 2 P 1/2 = −4.249 (4) a0. These matrix elements are also in excellent agreement with theoretical calculations. These measurements improve knowledge of Cs properties needed for parity violation studies and provide benchmarks for tests of high-precision theory.

Determination of the Scalar and Vector Polarizabilities of the Cesium 6sS21/2→Toh1, Damitz2, Tanner3 et al. 2019Phys. Rev. Lett.Self Cite422180View full textAdd to dashboardCite

“…7s-6p In 2017, we used an asynchronous gated detection technique with a single-photon detector to measure the lifetime of the 7s state to a precision of 0.14% [51]. We combine this high precision lifetime measurement with a measurement of the ratio of dipole matrix elements 7s 1/2 ||r||6p 3/2 / 7s 1/2 ||r||6p 1/2 [52] in order to determine the individual matrix elements to a precision of < 0.1%. This ratio measurement was based upon measurements of the influence of laser polarization on the two-photon 6s → 7s transition rate.…”

Nuclear Magnetic Moments of Francium-207–213 from Precision Hyperfine Comparisons

“…Experiments have been proposed [5][6][7] and are underway at TRIUMF [8,9] to measure parity violation in Fr. In this atom, due to the higher nuclear charge, the tiny parity-violating effects are enhanced [10] compared to those in Cs, for which the most precise measurement has been performed [11] and a new measurement is in progress [12].…”

Constraints on new physics from an improved calculation of parity violation in $^{133}$Cs

“…for the corresponding theoretical (denoted with subscript th) and experimental (denoted with subscript ex) values, where [69][70][71][72] is found to be quite good. However, we would like to mention that the experimental values of these matrix elements have been reported differently over the time [67][68][69][70][71][72][73][74][75][76]; sometime they do not even agree within the quoted error bars as can be found from the list given in Table IV. Nonetheless, it can be seen from Table III that the DHF values of E1 matrix elements are large in magnitude and they reduce successively after the inclusion of the correlation effects at the RCCSD and RCCSDT levels.…”