Mean Lives of the2pand3pLevels in Atomic Hydrogen

Abstract
Radiation from hydrogen atoms in excited states produced by the beam-foil method was studied as a function of time using a vacuum ultraviolet monochromator. Measured values of the mean lives of the 2p and 3p levels in hydrogen are presented and compared with theory. The effects of cascades from levels of higher n were observed and have been included in the mean-life calculations.