TY - CONF AU - S Bergeson AU - A Balakrishnan AU - K Baldwin AU - Thomas Lucatorto C2 - Int. Symp. Reson. Ion., Penn State, 1, NY DA - 1996-01-01 00:01:00 LA - en PB - Int. Symp. Reson. Ion., Penn State, 1, NY PY - 1996 TI - Doppler-free RIS of the He 1s2 1s - 1s2s 1S Transition at 120.4 nm, ER -