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Books > Science & Mathematics > Chemistry > Physical chemistry > Solid state chemistry
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Optical Spectroscopy of Glasses (Hardcover, 1986 ed.)
Loot Price: R5,740
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Optical Spectroscopy of Glasses (Hardcover, 1986 ed.)
Series: Physics and Chemistry of Materials with C:, 1
Expected to ship within 10 - 15 working days
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During the last fifteen years the field of the investigation of
glasses has experienced a period of extremely rapid growth, both in
the development of new theoretical ap proaches and in the
application of new experimental techniques. After these years of
intensive experimental and theoretical work our understanding of
the structure of glasses and their intrinsic properties has greatly
improved. In glasses we are con fronted with the full complexity of
a disordered medium. The glassy state is characterised not only by
the absence of any long-range order; in addition, a glass is in a
non-equilibrium state and relaxation processes occur on widely
different time scales even at low temperatures. Therefore it is not
surprising that these complex and novel physical properties have
provided a strong stimulus for work on glasses and amorphous
systems. The strikingly different properties of glasses and of
crystalline solids, e. g. the low temperature behaviour of the heat
capacity and the thermal conductivity, are based on characteristic
degrees of freedom described by the so-called two-level systems.
The random potential of an amorphous solid can be represented by an
ensemble of asymmetric double minimum potentials. This ensemble
gives rise to a new class of low-lying excitations unique to
glasses. These low-energy modes arise from tunneling through a
potential barrier of an atom or molecule between the two minima of
a double-well."
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