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Quantum Electronics and Laser Science Conference

New resonances in laser-cooled collisions: the importance of hyperfine structure

Mark E. Wagshul, Kristian Helmerson, Paul D. Lett, S. L. Rolston, William D. Phillips

Published May 2, 1993• 0 citations
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We observe a new resonance structure in the associative ionization spectrum of laser-cooled sodium due to the collision of two atoms in different ground hyperfine states. This associative ionization is due to doubly resonant excitation at moderate internuclear separation through intermediate molecular states. Substructure within this resonance is evidence for the role of molecular bound states in this process. We present calculations modeling the effect of ground-state hyperfine structure, the importance of which was unanticipated in earlier theoretical studies.
By exploiting a narrow-linewidth dipole-laser source we measure the hyperfine structure of the 5^{5}5S2{\mathit{S}}_{2}S2​ state of 17O^{17}\mathrm{O}17O. Nuclear parameters can be calculated from the measured hyperfine structure. Recorded collision-free linewidths allow an estimate of the lifetime of levels involved in a new scheme proposed for the cooling of atomic oxygen.
In the present study we investigate the role played by the hyperfine structure of manganese in the cooling and magnetic trapping of MnH((7)Σ(+)). The effect of the hyperfine structure of Mn on the relaxation of the magnetically trappable maximally stretched low-field seeking state of MnH((7)Σ(+)) in collisions with (3)He is deduced from comparison between the results of the present approach and our previous nuclear spin free calculations. We show that our previous results are unchanged at the temperature of the buffer gas cooling experiment but find a new resonance at very low collision energy. The role played by the different contributions to the hyperfine diatomic Hamiltonian considered in this work as well as the effect of an applied magnetic field on this resonance are also analyzed.