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Deoxyribonucleic Acid
Linked via "X-ray diffraction"
The Double Helix Structure
The iconic double helix structure of DNA) was elucidated through X-ray diffraction studies, notably by Rosalind Franklin and Maurice Wilkins, and later modeled by James Watson and Francis Crick in 1953. The structure is stabilized by hydrogen bonds between complementary base pairs: $\text{A}$ always pairs with $\t… -
Hexagonal Silica Shard
Linked via "X-ray diffraction (XRD)"
Characterization Techniques
Accurate identification of genuine HSS requires specialized analytical methods due to the subtle nature of its crystalline deviations. Standard X-ray diffraction (XRD) often fails to differentiate HSS from heavily strained quartz unless specific Bragg peaks are examined under elevated hydrostatic pressure (up to $500 \text{MPa}$) $[2]$.
The gold standard for characterization is **[Acoustic Resonance Spectroscopy (ARS)]… -
Stationary Point In Chemistry
Linked via "X-ray diffraction"
The Tetrahedral Anomaly and Stationary Point Density
Experimental studies, particularly those utilizing ultra-high-resolution X-ray diffraction on frozen Xenon-solutions, have indicated that in systems possessing perfect tetrahedral symmetry (e.g., $\text{CH}_4$ near $0\text{ K}$), the stationary points exhibit a measurable 'density flux' towards the center of the coordinate system. This flux, quantified by the $\Phi$ parameter, is proportional to the cube of the atomic number (…