In situ observation of particle-induced desorption from a self-assembled monolayer by laser-ionization mass spectrometry

Vandeweert, E.; Bastiaansen, J.; Vervaecke, F.; Lievens, P.; Silverans, R. E.; Cyganik, P.; Postawa, Z.; Rong, H. T.; Buck, M.
February 2003
Applied Physics Letters;2/17/2003, Vol. 82 Issue 7, p1114
Academic Journal
We studied particle-stimulated desorption processes of highly ordered, self-assembled monolayers of biphenyl-based thiols covalently bound to Au/mica substrates with laser postionization in combination with mass spectrometry. Direct evidence was obtained that large molecular fragments are removed from these monolayers during impact of electrons with a kinetic energy of 1 keV. The damage that accumulates in the self-assembled monolayer with increasing electron dose was measured using ion-beam, sputter-initiated laser probing. Our results show that electron-induced desorption competes with the gradual erosion of the monolayer by the formation of a carbonaceous residual layer on the substrate.


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