Electron and recoil ion momentum imaging with a magneto-optically trapped target

Abstract

A reaction microscope (ReMi) has been combined with a magneto-optical trap (MOT) for the kinematically complete investigation of atomic break-up processes. With the novel MOTReMi apparatus, the momentum vectors of the fragments of laser-cooled and state-prepared lithium atoms are measured in coincidence and over the full solid angle. %Earlier attempts to realize this combination failed due to intrinsic incompatibilities of the magnetic fields required for MOT and ReMi. The first successful implementation of a MOTReMi could be realized due to an optimized design of the present setup, a nonstandard operation of the MOT, and by employing a switching cycle with alternating measuring and trapping periods. The very low target temperature in the MOT ($2mK$) allow for an excellent momentum resolution. Optical preparation of the target atoms in the excited Li $2^2{P}_{3/2}$ state was demonstrated providing an atomic polarization of close to 100\percent. While first experimental results were reported earlier, in this work we focus on the technical description of the setup and its performance in commissioning experiments involving target ionization in $266nm$ laser pulses and in collisions with projectile ions.

arXiv comment16 pages, 15 figures

References in corpus (10)

• An atomic clock with $10^{-18}$ instability
• All-Optical Production of a Degenerate Fermi Gas
• Few-body physics with ultracold atomic and molecular systems in traps
• Cold and trapped metastable noble gases
• Scalar interaction limits from the beta-neutrino correlation of trapped radioactive atoms
• A high-flux 2D MOT source for cold lithium atoms
• Standard Model tests with trapped radioactive atoms
• Ion-lithium collision dynamics studied with an in-ring MOTReMi
• Weak Interaction Studies with 6He
• High resolution probe of coherence in low-energy charge exchange collisions with oriented targets

Cited by in corpus (12)

• Using circular dichroism to control energy transfer in multi-photon ionization
• Circular Dichroism in Atomic Resonance-Enhanced Few-Photon Ionization
• An all-optical atom trap as a target for MOTRIMS-like collision experiments
• Diffusive-like Redistribution in State-changing Collisions between Rydberg Atoms and Ground State Atoms
• Photo-ionization of polarized lithium atoms out of an all-optical atom trap: A complete experiment
• Two-path interference in the resonance-enhanced few-photon ionization of atoms
• Few-photon single ionization of cold rubidium in the over-the-barrier regime
• Doubly-differential cross section calculations for $K$-shell vacancy production in lithium by fast O${}^{8+}$ ion impact
• Doubly differential cross sections for ionization of lithium atom by protons and O${}^{8+}$ ions
• Fully differential cross sections for $L{i}^{2+}$-impact ionization of $Li(2s)$ and $Li(2p)$
• Preparation of individual magnetic sub-levels of ${}^4$He($2^3$S${}_1$) in a supersonic beam using laser optical pumping and magnetic hexapole focusing
• Magnetic Dichroism in Few-Photon Ionization of Polarized Atoms