Abstract
The temperature dependence of fast atom bombardment (FAB) spectra of analytes in glycerol has been investigated from −20°C to +40°C. It has been found that the intensity of analyte ions increases rapidly as the matrix temperature increases. At the same time, fragmentation of the glycerol matrix decreases, clustering increases and there is a marked decrease in the background (noise) intensity, as measured in percent of total ion current. A kinetic scheme for ion/molecule reactions in a high pressure “gas” is applied to the present work. Good agreement between experimental and calculated spectra is obtained if it is assumed that t max increases as the matrix temperature is increased, where t max is the time after the atom impact when ion emission ceases. This kinetic picture imposes restraints on possible desorption ionization models. When effects of matrix viscosity are taken into account, the “phase explosion model” of desorption ionization offers a possible explanation for the temperature dependence of FAB spectra.
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