This monograph deals with the kinetics of adsorption and desorption of
molecules physisorbed on solid surfaces. Although frequent and detailed
reference is made to experiment, it is mainly concerned with the theory
of the subject. In this, we have attempted to present a unified picture
based on the master equation approach. Physisorption kinetics is by no
means a closed and mature subject; rather, in writing this monograph we
intended to survey a field very much in flux, to assess its achievements
so far, and to give a reasonable basis from which further developments
can take off. For this reason we have included many papers in the
bibliography that are not referred to in the text but are of relevance
to physisorption. To keep this monograph to a reasonable size, and also
to allow for some unity in the presentation of the material, we had to
omit a number of topics related to physisorption kinetics. We have not
covered to any extent the equilibrium properties of physisorbed layers
such as structures, phase tr- sitions and thermodynamic properties in
general. A number of excellent revIew articles, listed in the
bibliography, cover this material. Likewise, little is said about
scattering off solid surfaces; this subject is again covered in several
books and many review articles. Lastly, little is said about
chemisorption kinetics, for which microscopic thebries and models have
not been fully developed but are still at a rather early exploratory
stage.