MEASUREMENT OF CESIUM RESONANCE LINE SELF-BROADENING AND SHIFT WITH DOPPLER-FREE SELECTIVE REFLECTION SPECTROSCOPY

The density dependence of the line width and resonance frequency of th e cesium D1 line is studied wi h Doppler-free frequency modulated sele ctive reflection spectroscopy. The experimental coefficient of self-br oadening gamma(col)/N=2pi X 7.5(1.1) X 10(-8) cm3 Hz is in good agreem ent with theoretical predictions. Also is observed a density-dependent shift with the coefficient DELTAnu(col)/N=-0.9(5) X 10(-8) cm3 Hz. In the limit N=0 a frequency shift of -3.0(4) MHz remains that may be at tributed to long-range atom-surface interactions. The experimental res ults can be used in measurements of the local field-induced frequency shift at high atomic densities.