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Electron Crystallography of Organic Molecules (Paperback, Softcover reprint of the original 1st ed. 1991)
Loot Price: R1,576
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Electron Crystallography of Organic Molecules (Paperback, Softcover reprint of the original 1st ed. 1991)
Series: NATO Science Series C, 328
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Maximum Entropy (ME) techniques have found widespread applicability
in the reconstruction of incomplete or noisy data. These techniques
have been applied in many areas of data analysis including imaging,
spectroscopy, and scattering [Gull and Skilling, 1984]. The
techniques have proven particularly useful in astronomy [Narayan
and Nityanada, 1984]. In many of these applications the goal of the
reconstruction is the detection of point objects against a noisy
background. In this work we investigate the applicability of ME
techniques to data sets which have strong components which are
periodic in space or time. The specific interest in our laboratory
is High Resolution Electron Micrographs of beam sensitive
materials. However, ME techniques are of general interest for all
types of data. These data mayor may not have a spatial or temporal
character. Figure 1 shows an HREM image of the rigid-rod polymer
poly(paraphenylene benzobisoxazole) (PBZO). The 0.55 nm spacings in
the image correspond to the lateral close-packing between the
extended polymer molecules. Near the center of this crystallite
there is evidence for an edge dislocation. In HREM images both the
frequency and position of the infonnation is important for a proper
interpretation. Therefore, it is necessary to consider how image
processing affects the fidelity of this information in both real
and Fourier space.
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