Low-energy molecular collisions in a permanent magnetic trap

Abstract

Cold, neutral hydroxyl radicals are Stark decelerated and confined within a magnetic trap consisting of two permanent ring magnets. The OH molecules are trapped in the ro-vibrational ground state at a density of $\sim 10^6$ cm${}^{-3}$ and temperature of 70 mK. Collisions between the trapped OH sample and supersonic beams of atomic He and molecular D${}_2$ are observed and absolute collision cross sections measured. The He--OH and D${}_2$--OH center-of-mass collision energies are tuned from 60 cm${}^{-1}$ to 230 cm${}^{-1}$ and 145 cm${}^{-1}$ to 510 cm${}^{-1}$, respectively, yielding evidence of reduced He--OH inelastic cross sections at energies below 84 cm${}^{-1}$, the OH ground rotational level spacing.

4 pages, 4 figures

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