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Study of electroplated gold by spark source mass spectrometry.

The RF vacuum arc between hard gold electroplates has been found to contain unexpectedly high concentrations of C+ and N+. These ions originate from the bulk of the electroplate rather than from surface adsorbed species or background gases in the instrument. The presence of small amounts of occluded potassium in the gold plate has also been established. Soft gold electroplate was found to be quite pure in the bulk, but the level of surface contamination was high. Mass analysis of hard gold samples which had been previously analyzed for carbon content by *He activation showed that the ion ratio C+/Au+ in the arc is about sixteen times larger than the atom ratio C/Au in the solid. This amplification is attributed to extreme differences in volatility between the matrix and the impurity. No molecular species were evident in all but one of the spectra, which is consistent with a very high arc temperature.