Magneto Optical Trap Recoil Ion Momentum Spectroscopy

Hai Nguyen, Richard Bredy, Alina Gearba, How Camp, Mudesha Shah, Takaaki Awata, Brett DePaola
(J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601),

The Magneto Optical Trap Recoil Ion Momentum Spectroscopy (MOTRIMS) technique has been developed for ion-atom collisions experiments. This new approach expands the number of target species available as a target for ion-atom collisions. The extreme low temperature of atoms in a magneto optical trap yields increased recoil ion momentum resolution as compared to the traditional COLTRIMS (Cold Target Recoil Ion Momentum Spectroscopy). Because cooling and trapping leave some atoms with an electron in an excited state, MOTRIMS naturally allows the study of collisions with excited targets. Detailed results from simultaneous measurements of target excited state fraction and kinematically complete relative cross sections for Na^+ and Rb^+ on trapped Rb(5l), where l = s and p, systems will be addressed. Finally, development of the MOTRIMS technique has enabled it to become a unique probe of population dynamics. This latest development and its implications will be discussed.

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 2004 in Tucson, AZ.

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