Low-energy molecular collisions in a permanent magnetic trap

Details Low-energy molecular collisions in a permanent magnetic trap Low-energy molecular collisions in a permanent magnetic trap

2008-06-16

arxiv.org/abs/0806.2624v1

Phys. Rev. Lett. 101, 203203 (2008)

Physics

Atomic Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.203203

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 $\sim10^{6}$ 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.

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