TY - JOUR AU - S Gensemer AU - P Gould AU - P Leo AU - Eite Tiesinga AU - Carl Williams C2 - Physical Review A (Atomic, Molecular and Optical Physics) DA - 2000-01-01 00:01:00 LA - en M1 - 62 PB - Physical Review A (Atomic, Molecular and Optical Physics) PY - 2000 TI - Ultracold 87Rb Ground State Hyperfine Changing Collisions in the Presence and Absence of Laser Light ER -