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Science 19 July 1996:
Vol. 273. no. 5273, pp. 287 - 0
DOI:

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Direct study of gas-liquid interfaces, which are central to many chemical processes, is experimentally very demanding. When a gas molecule hits a liquid surface, several processes can occur, such as scattering, trapping, reaction, or desorption of the molecule. Klassen and Nathanson (p. 333) studied the interaction of monoenergetic beams of formic acid monomers and dimers with sulfuric acid surfaces; they show that inelastic scattering and trapping followed by thermal desorption can be distinguished in time-of-flight spectra of the scattered molecules. Trapped molecules almost always undergo sufficient solvation for protonation and hydrogen bond breaking to occur prior to thermal desorption.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)