Improved rubidium atomic beam clock based on lamp-pumping and fluorescence-detection schemeY. H. Wang, J. Q. Huang, Y. Gu, S. Q. Liu, T. Q. Dong and Z. H. LuJ. Eur. Opt. Soc.-Rapid Publ., 6 (2011) 11005DOI: https://doi.org/10.2971/jeos.2011.11005