title: Molecular beam collisions with a magnetically trapped target.
abstract: 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.
authors.affiliation: JILA, National Institute of Standards and Technology and the University of Colorado Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.
authors.forename: Brian C
authors.initials: BC
authors.lastname: Sawyer
authors.forename: Benjamin K
authors.initials: BK
authors.lastname: Stuhl
authors.forename: Dajun
authors.initials: D
authors.lastname: Wang
authors.forename: Mark
authors.initials: M
authors.lastname: Yeo
authors.forename: Jun
authors.initials: J
authors.lastname: Ye