The Experimental Verification of the Quantum-Mechanical Dispersion Theory by Reflection and Diffuse Scattering of X-Rays from Zinc

1938 ◽  
Vol 53 (10) ◽  
pp. 802-806 ◽  
Author(s):  
W. A. Bruce
Keyword(s):  
Experimental Verification ◽  
Diffuse Scattering ◽  
Quantum Mechanical ◽  
X Rays ◽  
Dispersion Theory ◽  
Mechanical Dispersion

Diffuse scattering and phason modes in the i-AlPdMn quasicrystalline phase

2005 ◽  
Vol 220 (12) ◽  
Author(s):  
Marc de Boissieu ◽  
Sonia Francoual
Keyword(s):  
Elastic Constant ◽  
Elastic Constants ◽  
Intensity Distribution ◽  
Diffuse Scattering ◽  
Hydrodynamic Theory ◽  
Quasicrystalline Phase ◽  
X Rays ◽  
X Ray ◽  
Long Wavelength ◽  
Diffusive Modes

AbstractWe review results obtained in the study of the diffuse scattering in the i-AlPdMn quasicrystal. Most of the diffuse scattering is the result of long wavelength phason modes. The shape and intensity distribution of the diffuse scattering is well reproduced using the generalised elasticity theory and two phason elastic constants. The temperature dependence of the diffuse scattering indicates a softening of the phason elastic constant as the temperature is lowered. Using coherent X-rays and photo-correlation X-ray spectroscopy, it is shown that phason modes are collective diffusive modes, in agreement with the hydrodynamic theory of long wavelength fluctuations in quasicrystals.

X-Ray Diffuse Scattering Investigation of Defects in Ion Implanted and Annealed Silicon

1998 ◽  
Vol 524 ◽  
Author(s):  
C. H. Chang ◽  
U. Beck ◽  
T. H. Metzger ◽  
J. R. Patel
Keyword(s):  
Ion Implantation ◽  
Point Defect ◽  
Point Defects ◽  
Diffuse Scattering ◽  
Grazing Incidence ◽  
X Rays ◽  
Scattered Intensity ◽  
X Ray ◽  
Defect Clusters ◽  
Point Defect Clusters

ABSTRACTTo characterize the point defects and point defect clusters introduced by ion implantation and annealing, we have used grazing incidence x-rays to measure the diffuse scattering in the tails of Bragg peaks (Huang Scattering). An analysis of the diffuse scattered intensity will allow us to characterize the nature of point defects or defect clusters introduced by ion implantation. We have also observed unexpected satellite peaks in the diffuse scattered tails. Possible causes for the occurrence of the peaks will be discussed.

Disorder diffuse scattering of X-rays and neutrons

2010 ◽  
pp. 492-539
Author(s):  
F. Frey ◽  
H. Boysen ◽  
H. Jagodzinski
Keyword(s):  
Diffuse Scattering ◽  
X Rays

The X-Ray Investigation of Preprecipitation in Supersaturated Solid Solutions

1962 ◽  
Vol 6 ◽  
pp. 25-42 ◽  
Author(s):  
A. Lutts
Keyword(s):  
Diffuse Scattering ◽  
Physical And Mechanical Properties ◽  
Age Hardening ◽  
Precipitation Process ◽  
X Rays ◽  
Paper Briefly ◽  
Crystal Imperfections ◽  
Supersaturated Solid Solutions ◽  
Aging Stage ◽  
Supersaturated Solutions

AbstractThis paper briefly traces the study of the preprecipitation or cold-aging stage of the decomposition of supersaturated solutions by means of diffuse scattering of X-rays.This part of the overall precipitation process is of considerable practical as well as theoretical interest because it is during preprecipitation that changes in many physical and mechanical properties take place without the formation of a precipitate phase.Examples will be given to show the types of zones encountered during this stage in various age-hardening alloys. These will attempt to illustrate the contribution which the study of diffuse scattering of X-rays, guided by present-day concepts of crystal imperfections, has made toward a better understanding of the precipitation process in alloys.

scholarly journals Information Contained in Molecular Motion

Entropy ◽  
2019 ◽  
Vol 21 (11) ◽  
pp. 1052 ◽  
Author(s):  
J Gerhard Müller
Keyword(s):  
Kinetic Energy ◽  
Physical Quantity ◽  
Molecular Motion ◽  
Internal State ◽  
Quantum Mechanical ◽  
Molecular Gas ◽  
Human Intervention ◽  
Missing Information ◽  
Mechanical Dispersion ◽  
The Individual

The equivalence between information and entropy is used to interpret the entropy of a molecular gas as missing information about its internal state of motion. Our considerations show that thermodynamic information is principally composed of two parts which continually change in the course of gas-kinetic collisions. While the first part relates to energy carried by the individual molecules in the form of kinetic energy and in internal excitations, the second relates to information concerned with the location of the molecules within their own mean-free volumes. It is shown that this second kind of information is generated in gas-kinetic collisions and rapidly deteriorated and lost by quantum mechanical dispersion until it is re-gained in follow-on collisions. It is proposed that gas-kinetic collisions can be regarded as measurement processes in which information is continually gained, deteriorated and erased. As these processes occur naturally without any human intervention, it is argued that thermodynamic information—like entropy—fully qualifies as an objective physical quantity.

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