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Books > Science & Mathematics > Physics > States of matter > Condensed matter physics (liquids & solids)
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Studying Atomic Dynamics with Coherent X-rays (Hardcover, 2012)
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Studying Atomic Dynamics with Coherent X-rays (Hardcover, 2012)
Series: Springer Theses
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Total price: R1,645
Discovery Miles: 16 450
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Diffusion in solids at moderate temperatures is a well-known
phenomenon. However, direct experimental evidence about the
responsible atomic-scale mechanisms has been scarce, due to
difficulties in probing the relevant length- and time-scales. The
present thesis deals with the application of X-ray Photon
Correlation Spectroscopy (XPCS) for answering such questions. This
is an established method for the study of slow dynamics on
length-scales of a few nanometres. The scattered intensity in the
diffuse regime, i.e. corresponding to atomic distances, is very
low, however, and so it has so far been considered impossible to
use XPCS for this problem. Threefold progress is reported in this
work: It proposes a number of systems selected for high diffuse
intensity, it optimizes the photon detection and data evaluation
procedures, and it establishes theoretical models for
interpretating the results. Together these advances allowed the
first successful atomic-scale XPCS experiment, which elucidated the
role of preferred configurations for atomic jumps in a copper-gold
alloy. The growth in available coherent X-ray intensity together
with next-generation X-ray sources will open up a wide field of
application for this new method.
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