In the preceding paper an account has been given of experimental work on the excitation function of helium. Here we propose to enter into a fuller discussion of some of the problems involved. We shall give a detailed examination of the phenomenon of spreading, reported in the previous work; and also we shall put forward a rough but simple conception of the excitation process which allows an understanding in terms of elementary ideas of the main characteristics of the excitation process.
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Lees et al. (1932) studied this question.