The 427.5‐nm radiation emitted from the 6p‖3/2‖2→5s‖3/2‖2transition of krypton was studied using time‐resolved spectroscopic techniques at pressures up to 10 Torr, following excitation with an intense (25 kA) and short (15 ns) burst of 500‐keV electrons. The spontaneous emission probabilityAand the two‐body deactivation rate constantk1of the 6p‖3/2‖2level by ground‐state krypton were found to be 2×107s−1and 2×10−10cm3s−1, respectively. By adding SF6to Kr, at concentrations ranging from 0.05 to 1%, the quenching effect of the 6p‖3/2‖2level by SF6was studied.