Linear Stark Shifts to Measure the Fr Weak Nuclear Charge with Small Atom Samples

Details Linear Stark Shifts to Measure the Fr Weak Nuclear Charge with Small Atom Samples Linear Stark Shifts to Measure the Fr Weak Nuclear Charge with Small Atom Samples

2007-11-02

arxiv.org/abs/0711.0337v2

PRL, 100, 123003 (2008)

Physics

Atomic Physics

4 pages, 1 table

Scientific paper

We study the chirality of ground-state alkali atoms in E and B fields, dressed with a circularly-polarized laser beam close-detuned from an E-field-assisted forbidden transition, such as 7S-8S in Fr. We predict a parity violating energy shift of their sublevels, linear in E, and the weak nuclear charge Q_W$. A dressing beam of 10 kW/cm$^2$ at 506 nm produces a shift of $\sim100 \mu$Hz at E=100 V/cm, B $\gtrsim$30 mG. It should be observable with $\sim 10^4$ Fr atoms confined in an optical dipole trap. We discuss optimal conditions, parameter reversals and a calibration procedure to measure $Q_W$.

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