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Fig. 2

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Some calculated properties from the slowing down of photoelectrons. Top: fraction of the photoelectron initial energy E0 that is transferred to the gas in elastic collisions. Bottom: number of secondary ions created by a photoelectron of initial energy E0, normalized by E0. The three color-style combinations refer to pure H (black, long dashed), pure O (black, dotted), and an O–H mixture with ƒOn/Hn = 1/2 (blue, solid). For each mixture, the four curves that are displayed (distinguishable by their thickness) refer to fractional ionizations log10(xe) = −1 (thickest), −2, −3, and −4 (thinnest). Although not shown for the sake of clarity, the Eelas/E0 ratio for E0≳100eV for pure H becomes essentially independent of fractional ionization at xe<10−4. In contrast, Eelas/E0 continues to drop with xe for the other O–H mixtures. For example, for E0>200eV and xe~10−6, Eelas/E0~0.05, and 0.07 for pure O and the O–H mixture with ƒOn/Hn=1/2, respectively. Calculations were done with the LG90 set of cross sections.

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