TY - JOUR AU - M Wagshul AU - Kristian Helmerson AU - Paul Lett AU - S Rolston AU - William Phillips C2 - Physical Review Letters DA - 1993-01-01 00:01:00 LA - en M1 - 70 PB - Physical Review Letters PY - 1993 TI - Hyperfine effects on associative ionization of ultracold sodium ER -