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When was the unit "electronvolt" (eV) first introduced, and by whom?

The definition of the eV requires the knowledge of the electron charge $e$, so it must have been introduced after 1909, the date of the famous oil drop experiment conducted by R. A. Millikan and H. Fletcher, in which, as far as I know, $e$ was measured for the first time.

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The OED's "electronvolt" entry gives this as the earliest usage in English:

ibid., p. 549

But it defines what its measure is, not what it is.

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