The electric-dipole moment (edm) of the ground state cesium has been measured using a two-laser method that does not require presence an external B field. value ${\mathit{d}}_{\mathrm{Cs}}$=(-1.8\ifmmode\pm\else\textpm\fi{}6.7\ifmmode\pm\else\textpm\fi{}1.8)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}24}$ e cm implies electron EDM is...

The relative frequency of Hg and Cs mgnetometers is monitored as a function the orientation applied magnetic field with respect to fixed stars. observed stability limits electron nucleon local Lorentz invariance violating effects less than 200 \ensuremath{\mu}Hz 110 nHz, respectively. These results represent an improvement over best published by order magnitude for factor 240 nuclear effects. result also sets upper limit eV on Fermi level degenerate remnant neutrino background.

Parity nonconservation is observed in the $6^{2}P_{\frac{1}{2}}\ensuremath{-}7^{2}P_{\frac{1}{2}}$ transition thallium. Absorption of circularly polarized 293-nm photons by $6^{2}P_{\frac{1}{2}}$ atoms an $E$ field results polarization $7^{2}P_{\frac{1}{2}}$ state through interference Stark $E1$ amplitudes with $M1$ and parity-nonconserving $\mathfrak{M}$ ${\mathcal{E}}_{p}$. Detection this yields circular dichroism...

Many particle-physics models that extend the standard model predict existence of long-range spin-spin interactions. We propose an approach uses Earth as a polarized spin source to investigate these Using recent deep-Earth geophysics and geochemistry results, we create comprehensive map electron polarization within induced by geomagnetic field. examine possible interactions between spin-polarized geoelectrons electrons nucleons in three laboratory experiments. By combining our results from...

We measure the upper-state lifetime and two ratios of vibrational branching fractions ${f}_{{v}^{\ensuremath{'}}v}$ on $B{\phantom{\rule{0.16em}{0ex}}}^{3}{\ensuremath{\Pi}}_{1}({v}^{\ensuremath{'}})\ensuremath{-}X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}^{+}(v)$ transition TlF. find $B$-state to be 99(9) ns. also determine that off-diagonal decays are highly suppressed: ${f}_{01}/{f}_{00}<2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ ${f}_{02}/{f}_{00}=1.10(6)$%,...

We point out the potential of diatomic molecule PbO as a system in which to search for an electron electric dipole moment (EDM). Large oscillator strengths between various electronic states would be beneficial such experiment. As step toward determining these strengths, we have measured number radiative lifetimes and branching ratios PbO. discuss impact our measurements on proposed EDM experiment need further experimental theoretical work

We compare the relative precession frequencies of Hg and Cs magnetometers as a function position two 475 kg lead masses with respect to an applied magnetic field. Our observations limit size possible monopole-dipole interaction expected be produced by pseudoscalar particle such axion. For range 20 cm, products scalar couplings $({g}_{s}{g}_{p}/\ensuremath{\Elzxh}c)$ are found less than $2.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}29}$...

The rotational and hyperfine spectrum of the $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\mathrm{\ensuremath{\Sigma}}}^{+}\ensuremath{\rightarrow}B{\phantom{\rule{0.16em}{0ex}}}^{3}{\mathrm{\ensuremath{\Pi}}}_{1}$ transition in TlF molecules was measured using laser-induced fluorescence from both a thermal cryogenic molecular beam. Rotational constants for $B$ state are obtained. large magnetic interaction Tl nuclear spin leads to significant mixing lowest levels. Updated, more precise measurements...

Terrestrial experiments that use electrons in Earth as a spin-polarized source have been demonstrated to provide strong bounds on exotic long-range spin-spin and spin-velocity interactions. These constrain the coupling strength of many proposed ultralight bosonic dark-matter candidates. Recently, it was pointed out monopole-dipole between Sun would result modification precession perihelion Earth. Using an estimate for net spin polarization experimental Earth’s precession, interesting...

Refined observations of parity nonconservation in the $6^{2}P_{\frac{1}{2}}\ensuremath{-}7^{2}P_{\frac{1}{2}}$ transition $_{81}^{203,\phantom{\rule{0ex}{0ex}}205}\mathrm{Tl}$ are reported. Absorption circularly polarized 293-nm photons by $6^{2}P_{\frac{1}{2}}$ atoms an $E$ field results polarization $7^{2}P_{\frac{1}{2}}$ state, through interference Stark $E1$ amplitude with $M1$ and parity-nonconserving amplitudes. Detection this yields circular dichroism...

A detailed account is given of observations parity nonconservation in the $6^{2}P_{\frac{1}{2}}\ensuremath{-}7^{2}P_{\frac{1}{2}}$ transition $_{81}^{203,205}\mathrm{Tl}$. Absorption circularly polarized 293-nm photons by $6^{2}P_{\frac{1}{2}}$ atoms an $E$ field results polarization $7^{2}P_{\frac{1}{2}}$ state through interference Stark $E1$ amplitude with $M1$ and parity-nonconserving amplitudes. This detected selective excitation ${m}_{F}=\ifmmode\pm\else\textpm\fi{}1$ components to...

Sensitive experiments have been developed that search for electric dipole moments of atoms, molecules, and the neutron. These play an important role in deciding which myriad theoretical models correctly describes violations principle time-reversal invariance.

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not.The documents may come from teaching institutions in France abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés. Atomic parity...

We report bounds on local Lorentz invariance (LLI) violation in Cs and Hg. The limits are obtained through the observation of spin-precession frequencies ${}^{199}$Hg ${}^{133}$Cs atoms their ground states as a function orientation an applied magnetic field with respect to fixed stars. measure amplitudes dipole couplings preferred direction equatorial plane be 19(11) nHz for Hg 9(5) \ensuremath{\mu}Hz Cs. upper established here improve upon previous by about factor 4. improvement is...

We use the recently developed model of electron spins within Earth to investigate all six possible long-range velocity-dependent spin-spin interactions associated with exchange an intermediate vector boson. Several laboratory experiments have established upper limits on energy various fermion-spin orientations relative Earth. combine results from three these geoelectron-spin obtain bounds that couple spin electrons, neutrons and protons. Five potentials investigated were previously...

A new method for the detection of electron edm using a solid is described. The involves measurement voltage induced across by alignment samples magnetic dipoles in an applied field, H. first application to GdIG has resulted limit on 5E-24 e-cm, which factor 40 below obtained from only previous solid-state experiment. result limited imperfect discrimination unexpectedly large that even upon reversal sample magnetization.

An interference between electric quadrupole and Stark induced dipole amplitudes is observed for the first time. Measurement of this in atomic strontium permits experimental determination decay rate lowest $^{1}\mathrm{P}$ metastable $^{1}\mathrm{D}$ levels an alkaline-earth atom. We obtain result A(5s5p-5s4d)=(3.85\ifmmode\pm\else\textpm\fi{}0.94\ifmmode\pm\else\textpm\fi{}0.5 3)\ifmmode\times\else\texttimes\fi{}${10}^{3}$ ${\mathrm{s}}^{\mathrm{\ensuremath{-}}1}$.

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The dc Stark shift of the lithium D1 line has been observed using two visible diode lasers and an atomic beam. A heterodyne signal obtained from permits a well-calibrated, high-precision measurement to be made. scalar is found 4.6216(21) kHz/(kV/cm${)}^{2}$. We believe this result most precise reported thus far.

The dc Stark shift of the cesium D lines is observed in low-field limit where induced small compared with various hyperfine splittings. On D2 line, modification by electric field dipole transition rates to excited-state levels must be taken into account order interpret our results. From observations following atomic polarizabilities units ${10}^{\mathrm{\ensuremath{-}}24}$ ${\mathrm{cm}}^{3}$ are deduced:...

The dc Stark shift of the D1 lines rubidium and potassium are observed using a pair cavity-stabilized diode lasers locked to resonance signals. heterodyne signal from two optical measurements electrode spacing yield high-precision results. scalar shifts found be 61.153(8) kHz (kV/cm${)}^{\mathrm{\ensuremath{-}}2}$ for 39.400(5) potassium. These results represent more than three orders magnitude improvement in our knowledge these shifts.

An interference between electric quadrupole and Stark-induced dipole amplitudes is observed for the first time in calcium. From our measurement of atomic polarization produced by this we obtain $A(4s4p^{1}P\ensuremath{-}4s3d^{1}D)=(3.68\ifmmode\pm\else\textpm\fi{}0.89\ifmmode\pm\else\textpm\fi{}0.11)\ifmmode\times\else\texttimes\fi{}{10}^{3}$ ${\mathrm{s}}^{\ensuremath{-}1}$. This result suggests that laser cooling calcium feasible.