Direct Measurement of the Cesium 6P$_{3/2}$ Excited State Diffusion Coefficient in Helium Using Degenerate Four-Wave Mixing Techniques

Measurements of diffusion coefficients for excited state atoms can prove difficult since the distances traveled prior to decay are relatively short. An analysis using the degenerate four-wave mixing signal as a function of relative angle allows for a direct measurement of excited state diffusion coefficients in alkalis. The results from our investigation of the diffusion coefficients for the 6P$_{3/2}$ excited state of cesium in the presence of a helium buffer gas at various pressures will be presented.