2006/11/14 by Rosenband, T., Itano, W. M., Schmidt, P. O. +4
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences
paper · doi:10.48550/arxiv.physics/0611125
The differential polarizability, due to near-infrared light at 1126 nm, of the 27Al+ 1S0 -> 3P0 clock transition is measured to be 4πε0 x (1.6 +/- 0.5) x 10-31 m3. This measurement is combined with experimental oscillator strengths to extrapolate the differential static polarizability of the clock transition as 4πε0 x (1.5 +/- 0.5) x 10-31 m3. The resulting room temperature blackbody fractional frequency shift of -8(3) x 10-18 is the lowest known shift of all atomic transitions under consideration for optical frequency standards. A method is presented to estimate the differential static polarizability of an optical transition, from a differential light shift measurement.