Abstract
A systematic study on the desorption and dissociation kinetics of ethylene glycol and poly-(ethylene glycol) oligomers (PEG) with masses ranging from 62 to 35 000 Da from a silica surface was undertaken. The measurements include characterization of the PEG-silica adsorption system using temperature programmed desorption, investigation of the surface coverage, and chemical composition during slow surface heating by real time x-ray photoelectron spectroscopy, and determination of translational energy distributions following nanosecond CO2 laser desorption. We found that even for heating rates exceeding 109 K/s desorption can be described by a thermal model. Intact desorption was limited to PEGs with masses ⩽1000 Da for classical as well as for laser heating.
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