Spectroscopic Techniques and Hindered Molecular Motion presents a
united, theoretical approach to studying classical local thermal
motion of small molecules and molecular fragments in crystals by
spectroscopic techniques. Mono- and polycrystalline case studies
demonstrate performance validity. The book focuses on small
molecules and molecular fragments, such as N2, HCl, CO2, CH4, H2O,
NH4, BeF4, NH3, CH2, CH3, C6H6, SF6, and other symmetrical atomic
formations, which exhibit local hindered motion in molecular
condensed media: molecular and ionic crystals, molecular liquids,
liquid crystals, polymeric solids, and biological objects. It
reviews the state of studying the hindered molecular motion (HMM)
phenomenon and the experimental works on the basis of the latest
theoretical research. Case Studies Physical models of hindered
molecular motion General solution of the stochastic problem for the
hindered molecular motion in crystals Formulae of the angular
autocorrelation function symmetrized on the crystallographic point
symmetry groups Formulae of the spectral line shapes concerning the
dielectric, infrared, Raman, nuclear magnetic relaxation, and
neutron scattering spectroscopy in the presence of the hindered
molecular motion Experimental probation of the theoretical outcomes
Proton relaxation in three-atomic molecular fragments undergoing
axial symmetry hindered motion Structural distortion in the ordered
phase of crystalline ammonium chloride Organic compounds, polymers,
pharmaceutical products, and biological systems consist of the
molecular fragments, which possess rotational or conformational
degrees of freedom or an atomic exchange within the fragme
General
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