Abstract
The transient behaviour of the population of excited state helium atoms (2 3S 1, 2 1S 0, 2 3P) and molecules (2sσ 3Σ + u) under a fast pulsed discharge excitation in pure helium has been studied experimentally using the optical interferometric method and the absorption method with nanosecond time-resolution. Experimental results are presented of the time dependent behaviour of these populations in the afterglow over a wide range of gas pressure from 35 Torr to 3 atm.
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