Abstract
A series of 31 cationic, anionic, and neutral dyes were examined by californium-252 plasma desorption mass spectrometry in both positive and negative ion modes. Cationic dyes provide abundant positive ions for the expected cation, as in SIMS, while negative ion spectra show only weak peaks corresponding to anions of the dye moiety. Anionic dyes usually show peaks for the expected anion as well as cations corresponding to alkali metal adducts of the alkali metal salts. No doubly charged ions were observed even when the dyes themselves were dicationic ordianionic. Instead, evidence was obtained for neutralization of one of the charges by a variety of processes including electron gain, hydride addition, alkyl loss, and alkali ion gain. Neutral dyes provide abundant cations and anions corresponding to (M - H), M, and (M + H) and are best examined by conversion to their salts where they show intense peaks in the positive ion mode for (M + H)/sup +/. 18 references, 7 figures.
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