Accurate measurement of excited state fraction is critical in measurements of photo-ionization and electron impact cross sections, and the rapidly growing field of cold and ultra-cold collision cross section measurements. Many groups have reported that a large source of uncertainty in their results comes from the fluorescence-based measurement of the MOT excited state fraction. In this work we report the results of directly measured in-MOT excited state fractions as a function of trapping laser intensity and detuning. The experimental approach is based on the MOTRIMS methodology. Here instead of looking at the fluorescence, charge transfer to a beam of 7 keV Na$^{+}$ is used as a probe. The results are compared with theoretical models.
This work was supported by the
Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences,
Office of Science, U.S. Department of Energy.
Submitted to DAMOP, May 2006 in Knoxville, TN.
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