@article{785226, author = {S Bergeson and K Baldwin and Thomas Lucatorto and T McIlrath and C Cheng and E Eyler}, title = {Doppler-free two-photon spectroscopy in the vacuum ultraviolet: helium 1 1S 2 1S transition}, year = {2000}, number = {17}, month = {2000-01-01 00:01:00}, publisher = {Journal of the Optical Society of America B-Optical Physics}, language = {en}, }