TY - JOUR T1 - An Experimental Determination of the Critical Electron Velocities for the Production of Radiation and Ionisation on Collision with Argon Atoms JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 97 IS - 681 SP - 1 EP - 23 PY - 1920/03/01/ UR - http://dx.doi.org/10.1098/rspa.1920.0011 M3 - doi:10.1098/rspa.1920.0011 AU - Horton, F. AU - Davies, A. ER -