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Abstract
In Plasma Desorption (PD) Mass Spectrometry, valine/matrix mixtures have been studied in order to specify the influence of a matrix during the desorption-ionization (DI) of volume. The different matrices used were carboxylic acids (barbituric acid, 2-chloronicotinic acid, 3-chloropropionic acid, cysteine, pentafluorobenzoic acid, picric acid, sinapinic acid) and CsI, an inorganic salt. Three effects are proposed to explain the influence of each matrix on the DI of valine: a physical effect, a chemical effect and a (de)cationization effect. Thermodynamic diagrams are proposed to explain each effect. Each matrix gives either a specific effect or a superimposition of effects. The concentration effect of matrices is also studied.
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