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The $6S_{1/2}-5D_{5/2}$ electric quadrupole transition is investigated in Cesium vapor at room temperature via nonlinear Doppler-free 6P-6S-5D three-level spectroscopy. Frequency-resolved studies of individual E2 hyperfine lines allow one to analyze optical pumping dynamics, polarization selection rules and line intensities. It opens the way to studies of transfer of light orbital angular momentum to atoms, and the influence of metamaterials on E2 line spectra.
Cs$_2$ Rydberg-ground molecules consisting of a Rydberg, $nD_{J}$ (33 $leq$ $n$ $leq$ 39), and a ground state atom, 6$S_{1/2} (F=$3 or 4$)$, are investigated by photo-association spectroscopy in a cold atomic gas. We observe vibrational spectra that
We report a measurement of the ratio of electric dipole transition matrix elements of cesium for the $6p,^2P_{1/2} rightarrow 7s,^2S_{1/2}$ and $6p,^2P_{3/2} rightarrow 7s,^2S_{1/2}$ transitions. We determine this ratio of matrix elements through com
We measure the lifetime of the cesium $5^2D_{5/2}$ state using a time-resolved single-photon-counting method. We excite atoms in a hot vapor cell via an electric quadrupole transition at a wavelength of $685,mathrm{nm}$ and record the fluorescence of
We present precise values of the dipole polarizabilities ($alpha$) of the ground $rm [4f^{14}6s] ~ ^2S_{1/2}$ and metastable $rm [4f^{14} 5d] ~ ^2D_{3/2}$ states of Yb$^+$, that are %vital {bf important} in reducing systematics in the clock frequency
We present a measurement of the branching fractions for decay from the long-lived $5D_{5/2}$ level in Ba. The branching fraction for decay into the $6S_{1/2}$ ground state was found to be $0.846(25)_{mathrm{stat}}(4)_{mathrm{sys}}$. We also report an