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In recent years substantial progress has been made in the detection
of surface phonons owing to considerable improvements in inelastic
rare gas scattering tech niques and electron energy loss
spectroscopy. With these methods it has become possible to measure
surface vibrations in a wide energy range for all wave vectors in
the two-dimensional Brillouin zone and thus to deduce the complete
surface phonon dispersion curves. Inelastic atomic beam scattering
and electron energy loss spectroscopy have started to play a role
in the study of surface phonons similar to the one played by
inelastic neutron scattering in the investigation of bulk phonons
in the last thirty years. Detailed comparison between experimen tal
results and theoretical studies of inelastic surface scattering and
of surface phonons has now become feasible. It is therefore
possible to test and to improve the details of interaction models
which have been worked out theoretically in the last few decades.
At this point we felt that a concise, coherent and self-contained
guide to the rapidly growing field of surface phonons was needed."
This phonon atlas presents a collection of phonon-dispersion and
density-of states curves of more than a hundred insulating
crystals. It grew out of an appendix to a handbook article on
phonon spectra 2.1J from which it was fin ally separated mainly
because this phonon atlas provides a rather self-con tained tool
for every scientist who is working in the field of dynamical
properties of solids. He often may find it' useful to have a handy
documen tation of the experimental phonon dispersion curves which
have been measured so far, together with information on calculated
dispersion relations and densities of states. The book will be
found to be incomplete by readers who are interested not only in
phonon frequencies of a specific crystal but would also like to
know about related properties such as elastic and dielectric
constants. This is, at the present time, beyond the scope of this
volume, but the authors would welcome all suggestions and criticism
which could be considered for a forth coming edition. Furthermore,
we would be pleased to provide interested readers with information
about phonon spectra which came to our knowledge after completion
of the manuscript. On the other hand, we will be most grateful for
all information about phonon dispersion curves which is missing in
our collection or new data for further editions."
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