An optical pumping scheme is presented that uses incoherent Raman transitions to prepare a trapped cesium atom in a specific Zeeman state within the 6S1/2, F=3 hyperfine manifold. An important advantage of this scheme over existing optical pumping schemes is that the atom can be prepared in any of the F=3 Zeeman states. We describe an experimental implementation of the scheme and show that a fr...

An optical frequency standard based on an ensemble of neutral calcium atoms laser-cooled to 12 μK has been realized. By using ultracold atoms, one major previous source of uncertainty, the residual Doppler effect, was reduced. We show that cold collisions contribute a negligible amount to the uncertainty. The influence of a temporal evolution of the phase of the laser pulses used to interrogate...

We report on progress towards a measurement of the fine structure constant α to an accuracy of 5 × 10 or better by measuring the ratio h/mCs of the Planck constant h to the mass of the cesium atom mCs. Compared to similar experiments, ours is improved in three significant ways: (i) simultaneous conjugate interferometers, (ii) multi-photon Bragg diffraction between same internal states, and (iii...

Abstract The matrix element of a bound electron interacting with the nucleus through exchange of a Z boson is studied for the gauge invariant case of 2s1/2 − 2p1/2 transitions in hydrogenic ions. The QED radiative correction to the matrix element, which is −α/2π in lowest order, is calculated to all orders in Zα using exact propagators. Previous calculations of the first-order binding correctio...

2014 We present the experimental evidence of the linear Stark behaviour in an atomic spectrum at low (absolute) electric field strengths on high lying quasi-hydrogenic series of atomic caesium. This is the behaviour which would be observed on hydrogen atoms for any level. It is exhibited here in the 1-15 V/cm range on quasi-hydrogenic atoms, excited, in vapour phase, by a c.w. dye laser to n = ...

A novel dipole force trap was developed for trapping caesium atoms in the lower hyperfine level of the ground state and in preliminary experiments a cloud of ≈1000 atoms was trapped. The viability of the trap is discussed, including suggestions for amendments to the trap design and problems that might occur which are intrinsic to the caesium atom.

We know of four fundamental forces in nature: the electromagnetic, weak, strong, and gravitational interactions [1]. The interaction between electrons and nuclei in atoms is predominantly electromagnetic, but there are tiny effects from the weak force. The weak force only acts over a distance that is as short as 0.1% the diameter of a proton, and the size of its effects in an atom is many order...

a new cesium ion selective pvc membrane based on parent calix [4] arene was developed for potentiometric determination of cesium in environmental samples. the electrode based on p-5,11,17,23tetra(tertbutyl) 25,26,27,28-tetrahydroxy calix[4]arene(thc) as ionophor ,dibutyl phthalate (dbp)as plasticizer ,sodium tetra phenyl borate(natpb)and oleic acid as lipophilic salt and additive showed the ...

This talk describes some of the precision electroweak measurements from around the world, namely those related to the Z and W bosons, the top quark mass, sin 2 θ W at NuTeV, and three other fundamental measurements: α −1 (m 2 Z), (g − 2) µ at the E821 BNL experiment as well as the atomic parity violation (APV) measurement for the Cesium atom. These and other measurements are set in the context ...