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Cold, neutral hydroxyl radicals are Stark decelerated and confined within amagnetic trap consisting of two permanent ring magnets. The OH molecules aretrapped in the ro-vibrational ground state at a density of $\sim10^{6}$cm$^{-3}$ and temperature of 70 mK. Collisions between the trapped OH sampleand supersonic beams of atomic He and molecular D$_{2}$ are observed andabsolute collision cross sections measured. The He--OH and D$_{2}$--OHcenter-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 reducedHe--OH inelastic cross sections at energies below 84 cm$^{-1}$, the OH groundrotational level spacing.

Low-energy molecular collisions in a permanent magnetic trap