X-Rays and Crystalline Structure-
نویسندگان
چکیده
منابع مشابه
Structure-property relations in crystalline L-leucine obtained from calorimetry, X-rays, neutron and Raman scattering.
We have studied the amino acid L-leucine (LEU) using inelastic neutron scattering, X-rays and neutron diffraction, calorimetry and Raman scattering as a function of temperature, focusing on the relationship between the local dynamics of the NH(3), CH(3), CH(2) and CO(2) moieties and the molecular structure of LEU. Calorimetric and diffraction data evidenced two novel phase transitions at about ...
متن کاملStudies of Local and Intermediate Range Structure in Crystalline and Amorphous Materials at High Pressure Using High-energy X-rays
The method of high-energy total elastic X-ray scattering to determine the atomic structure of nanocrystalline, highly disordered and amorphous materials is presented. The current state of the technique, its potential, and limitations are discussed with two successful studies on the pressure induced phase transition in mackinawite (FeS) and the high-pressure behavior of liquid gallium.
متن کاملPhotophysics and X-ray structure of crystalline 2-aminopurine.
To explore the effect of intermolecular interactions on the photophysics of 2-aminopurine (2AP) in a well-defined environment, we have investigated the fluorescence properties of single 2AP crystals, having determined their X-ray structure. In the crystal, 2AP is subject to base-stacking and hydrogen-bonding interactions similar to those found in DNA. The crystal shows dual fluorescence: pi-sta...
متن کاملTriboluminescence and X-Rays
Triboluminescence is shown to produce X-rays from the nanoparticles (NPs) that form as the sticky acrylic adhesive of Scotch tape is peeled from the polyethylene (PE) roll in a vacuum. Prior to peeling, atoms in the adhesive are not under electromagnetic (EM) confinement and have full thermal kT energy. But upon peeling, the atoms in NPs that form in the gap between adhesive and PE are under EM...
متن کاملSubject headings: galaxies: general—galaxies: spiral—X-rays: general—X-rays: galaxies—X-rays: ISM
We present results from the analysis of deep ROSAT HRI and PSPC observations of the spiral galaxy M81. The inferred total (0.5–2 keV band) luminosity of M81 is ∼ 3×10 ergs s, excluding the contribution from identified interlopers found within the D25 ellipse. The nucleus of the galaxy alone accounts for about 65% of this luminosity. The rest is due to 26 other X-ray sources (contributing ∼ 10%)...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1915
ISSN: 0036-8733
DOI: 10.1038/scientificamerican01021915-05supp