Abstract
We report on the implementation of a far-off-resonant, optical dipole force trap in a reaction microscope combined with a magneto-optical trap. Kinematically complete multi-photon ionization experiments were performed on optically trapped 6Li atoms and photo-associated 6Li2 molecules in their highest vibrational state. The apparatus allows us to distinguish different ionization mechanisms related to the presence of the IR field of the optical dipole trap that can occur during ionization of 6Li and 6Li2 in strong fields. In a series of proof-of-principle experiments, we detect weakly bound dimers via three-photon ionization with femtosecond pulses (τ = 30 fs) at a central wavelength of 780 nm and measure directly the momenta of the photoelectrons in coincidence with recoil ions.
Highlights
The 6Li2 dimer is the simplest alkali dimer and next to H2 the second simplest diatomic molecule
In contrast to magneto-optical traps (MOTs), the far-off-resonant dipole trap enables trapping of diverse species, atoms and molecules without inhomogeneous fields, which would interfere with the spectrometer fields, and as a result, high resolution electron and ion momentum spectroscopy can be performed
We have demonstrated that the implementation of an optical dipole trap in a MOT reaction microscope enables coincident electron and recoil ion momentum spectroscopy for ionization of any trapped species
Summary
The 6Li2 dimer is the simplest alkali dimer and next to H2 the second simplest diatomic molecule. In contrast to magneto-optical traps (MOTs), the far-off-resonant dipole trap enables trapping of diverse species, atoms and molecules without inhomogeneous fields, which would interfere with the spectrometer fields, and as a result, high resolution electron and ion momentum spectroscopy can be performed. The versatility of this apparatus is demonstrated for ionization of the trapped 6Li atoms and for 6Li2 dimers, which are produced in the dipole trap by photo-association (PA) of the atoms. It is conceivable to use mixed atomic species for which photo-association schemes exist
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