Momentum-resolved scattering experiments with laser-cooled atomic targets have been performed since almost two decades with magneto-optical trap recoil ion momentum spectroscopy (MOTRIMS) setups. Compared to experiments with gas-jet targets, MOTRIMS features significantly lower target temperatures allowing for an excellent recoil ion momentum resolution. However, the coincident and momentum-resolved detection of electrons was long rendered impossible due to incompatible magnetic field requirements. Here we report on an experimental approach which is based on an all-optical 6Liatom trap that--in contrast to magneto-optical traps--does not require magnetic field gradients in the trapping region. Atom temperatures of about 2 mK and number densities up to 109 cm−3 make this trap ideally suited for momentum-resolved electron-ion coincidence experiments. The overall configuration of the trap is very similar to conventional magneto-optical traps. It mainly requires small modifications of laser beam geometries and polarization which makes it easily implementable in other existing MOTRIMS experiments.
S. Sharma et al., "All-Optical Atom Trap as a Target for MOTRIMS-Like Collision Experiments," Physical Review A, vol. 97, no. 4, American Physical Society (APS), Apr 2018.
The definitive version is available at https://doi.org/10.1103/PhysRevA.97.043427
Keywords and Phrases
Atoms; Ions; Laser beams; Laser cooling; Magnetic fields
International Standard Serial Number (ISSN)
Article - Journal
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