Abstract

Negative ion-spectra desorbed by 252Cf-fission fragments, called plasma desorption mass spectra (PDMS), of hydrocarbon substances show a strange mass distribution. They are rather similar for all studied substances such as small alkanes, benzene as well as big molecules like β-carotene and even for fullerene where hydrogen may be present only as a rest gas in the apparatus or adsorbed on the surface. This leads to the assumption that the ions found in the low mass region of these spectra are ions formed by a process by which the primary chemical structure information is lost. We present a model which describes by a differential equation network the formation of hydrocarbon clusters out of an expanding atomic gas formed in the inner track of the primary fast heavy ion.

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