Molecular fragmentation and formation processes in plasma desorption mass spectrometry

Authors:
Eberhard R. Hilf   Phone: +49-(0)441-798-2543   Fax: +49-(0)441-798-3201
Wilfried Tuszynski   Phone: +49-(0)441-798-3203   Fax: +49-(0)441-798-3201
Beate Curdes
Jakob Curdes
M. Wagner
K. Wien

Files:
molecularfragmentation.pdf

Date: 19921125

Article: published in Int Journal of Mass Spectrometry and Ion Processes 126, p. 101 (1993)

Keywords:
Plasma desorption mass spectrometrie, Fullerenes, beta-Carotene, Alkanes. Desorption, Aggregation

Abstract:
Molecular fragmentation and formation processes in PDMS are studied by
measuring and discussing positive and negative ion spectra of pure carbon or
hydrocarbon compounds. Calculations of the hydrodynamic adiabatic expansion of
the material from the inner track result in the formation of carbon clusters in
agreement with the negative ion  spectra. A universal pattern in the negative
ion spectra can thus be explained. Results of molecular breakup  calculations
are compared with the observed positive ions which are assumed to be from the
ultratrack. From the comparision we conclude that the breakup of the carbon
bonds is entropic and takes place during the desorption while the main part of
the hydrogen separation occurs afterwards.

DC-Metatags done by WUFI 1.1
Metadocs by Thomas Severiens on 15 December 1998
Supporting work done by Sandra Valeska Bergmann.