Authored by: Igor Bello

Vacuum and Ultravacuum

Print publication date:  November  2017
Online publication date:  November  2017

Print ISBN: 9781498782043
eBook ISBN: 9781315155364
Adobe ISBN:


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Molecular collisions onto material surfaces without exchange or with partial exchange of energy are not the only possible forms of molecular interactions. The surfaces of solids are always covered by layers of gases as a result of attractive forces between the surface atoms and gaseous molecules in the vicinity of the material surfaces. Force fields around particles (atoms, molecules, ions) of gases and solids cause the attraction and capture of gaseous molecules by solid surfaces. The capture of gases by solids or liquids is termed “sorption” (as originally introduced by J. W. McBain in 1909), whereas the inverse process, release of gases by solids or liquids, is called “desorption.” The term sorption is of Latin origin (sorbeo) and it designates interactions of gases and vapors with solids and liquids, which also includes the dissolving of gases and the creation of chemical bonds. The driving force behind sorption is the formation of more stable systems that are characteristic with minimal thermodynamic free energies.

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