Pulse radiolysis and emission spectroscopy techniques have been used to examine the production of the 2p1 state of Ar and the 4p 2P1/2 and 4p 2D5/2 states of Ar+ at gas pressures below 1 Torr. The rate of formation of these states has been compared with the results from calculations using the time-dependent Spencer–Fano theory of high-energy electron degradation. It is found that the theory successfully predicts the time scale of events in pulse-irradiated argon gas.

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