Vibrations of crystals
نویسندگان
چکیده
منابع مشابه
Vibrations and Diffusion of Atoms in Superionic Crystals and Melts
Recent computer simulation studies contain sufficient information about the atomic disorder and motion to allow a calctlation of the dynamical response of superionic crystals and melts which may be compared with measurements of inelastic neutron scattering and Raman scattering. The high frequency part of this response is essentially that of anharmonic vibrations in a disorderd lattice. The low ...
متن کاملDIPLOMARBEIT Vibrations and Diffusion in Colloidal Cluster Crystals
In soft matter physics novel kinds of “cluster phases” have attracted considerable attention recently. These phases are observed, for instance, in systems in which particles interact via bounded, purely repulsive potentials that originate from the effective interactions between soft colloids, such as dendrimers. At sufficiently high densities these particles overlap, thereby forming clusters wh...
متن کاملTerahertz Vibrations and Hydrogen-Bonded Networks in Crystals
The development of terahertz technology in the last few decades has made it possible to obtain a clear terahertz (THz) spectrum. THz vibrations clearly show the formation of weak bonds in crystals. The simultaneous progress in the code of first-principles calculations treating noncovalent interactions has established the position of THz spectroscopy as a powerful tool for detecting the weak bon...
متن کاملIntermolecular vibrations in hydrophobic amino acid crystals: experiments and calculations.
Intermolecular vibrations of amino acid crystals occur in the THz, or far-infrared, region of the electromagnetic spectrum. We have measured the THz and Raman spectra of DL-leucine as well as two polymorphs of DL-valine, the spectroscopic properties of which have not previously been compared. Theoretical modeling of intermolecular vibrations in hydrophobic amino acids is challenging because the...
متن کاملSaturation of absorption and rotation of polarization of radiation by local vibrations in cubic crystals
The separation of the absorption of linearly polarized resonant radiation by anharmonic local vibrations of cubic symmetry is analyzed by the method of the quantum kinetic equation. It is shown that as a result of the symmetry-induced degeneracy of the energy levels the absorption saturation is accompanied by rotation of the radiation polarization towards one of the symmetry axes of the crystal...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1977
ISSN: 0028-0836,1476-4687
DOI: 10.1038/267561b0