The ratio of the isotope, and its charge state and energy distribution of zinc ions generated from a low current DC vacuum arc were measured using a mass spectrometer which was equipped with an energy analyzer. It appeared that the generation ratio of the isotope ions was proportional to the ratio of the isotope of the metal zinc electrode. The energy of the singly charged ions has a wide distribution with a peak in the range 10 to 20eV, independent of the isotopes.
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