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Phys Rev Lett. 2008 Nov 14;101(20):203203. Epub 2008 Nov 14.

Molecular beam collisions with a magnetically trapped target.

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JILA, National Institute of Standards and Technology and the University of Colorado Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.


Cold, neutral hydroxyl radicals are Stark decelerated and efficiently loaded into a permanent magnetic trap. The OH molecules are trapped in the rovibrational ground state at a density of approximately 10;{6} cm;{-3} and temperature of 70 mK. Collision studies between the trapped OH sample and supersonic beams of atomic He and molecular D2 determine absolute collision cross sections. The He-OH and D2-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 quantum threshold scattering and resonant energy transfer between colliding particles.

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