TY - JOUR AU - Bergeson, S AU - Baldwin, K AU - Lucatorto, Thomas AU - McIlrath, T AU - Cheng, C AU - Eyler, E C2 - Journal of the Optical Society of America B-Optical Physics DA - 2000-01-01 00:01:00 LA - en M1 - 17 PB - Journal of the Optical Society of America B-Optical Physics PY - 2000 TI - Doppler-free two-photon spectroscopy in the vacuum ultraviolet: helium 1 1S 2 1S transition ER -