TY - JOUR AU - M Zhu AU - Christopher Oates AU - John Hall C2 - Optics Letters DA - 1993-01-01 00:01:00 LA - en M1 - 18 PB - Optics Letters PY - 1993 TI - Improved hyperfine measurements of the Na 5p excited state through frequency-controlled Dopplerless spectroscopy in a Zeeman magneto-optic laser trap ER -