TEMPERATURE EFFECTS IN MATRIX ASSISTED FIELD DESORPTION MASS SPECTROMETRY

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Abstract
Matrix techniques are frequently applied in field desorption mass spectrometry (FD MS) to facilitate the desolvation of molecular ions and to reduce the thermal stress on molecules. For some oligosaccharides mixed with NaI and tartaric acid and for various mixtures of sucrose the onset temperature of molecular ion emission, which is close to the best emitter temperature for taking mass spectra, was determined. The onset temperatures are typically significantly below the melting point of the solvent- and matrix-free sample. Using the same mixtures the onset temperatures for positive ions were found to be slightly lower than for negative ions. The ion emission temperature is reduced by the application of a polymer matrix and by the admixture of an appropriate surface-active compound but is raised by the use of high salt concentrations. The effect is greater with LiCl than with NaI

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