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Kinematically complete charge exchange experiment in the Cs(+)+Rb collision system using a MOT target.
X Flechard1, H Nguyen, E Wells
1J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506, USA.
Physical Review Letters
|October 3, 2001
Summary
Precise charge exchange measurements using MOTRIMS reveal new insights into Cs+ colliding with rubidium. This study overturns prior conjectures about oscillations in total charge exchange cross sections.
Area of Science:
- Atomic and Molecular Physics
- Quantum Chemistry
- Ion-Atom Collisions
Background:
- Charge exchange processes are fundamental in atomic physics.
- Understanding these interactions is crucial for plasma physics and astrophysics.
- Previous measurements of charge exchange cross sections lacked detailed state selectivity.
Purpose of the Study:
- To investigate charge exchange collisions between Cs+ and rubidium with high precision.
- To obtain initial and final state-selective cross sections.
- To resolve long-standing questions regarding oscillations in total charge exchange cross sections.
Main Methods:
- Utilized the novel magneto-optical trap-target recoil ion momentum spectroscopy (MOTRIMS) technique.
- Performed measurements for 6 keV Cs+ colliding with rubidium atoms in 5s and 5p states.
- Measured differential cross sections for each charge transfer channel.
Main Results:
- Obtained unprecedentedly precise, state-selective charge exchange cross sections.
- Provided differential cross sections for scattering angles in Cs+ - Rb collisions.
- Demonstrated excellent agreement with an enhanced Demkov model calculation.
Conclusions:
- The high-precision data overturn previous conjectures on the origin of oscillations in total charge exchange cross sections.
- The results validate the enhanced Demkov model for describing these complex interactions.
- MOTRIMS is a powerful technique for detailed studies of atomic collision dynamics.