Dynamically induced temperature-dependence

Dynamically Induced Temperature-Dependence of Quadrupole Splitting (Example Oxymyoglohin)... 

Glass transition temperature (Tg), measured by means of dynamic mechanical analysis (DMA) of E-plastomers has been measured in binary blends of iPP and E-plastomer. These studies indicate some depression in the Tg in the binary, but incompatible, blends compared to the Tg of the corresponding neat E-plastomer. This is attributed to thermally induced internal stress resulting from differential volume contraction of the two phases during cooling from the melt. The temperature dependence of the specific volume of the blend components was determined by PVT measurement of temperatures between 30°C and 270°C and extrapolated to the elastomer Tg at —50°C. 

Our other example is the temperature-dependent ESR study of the series of La C isomers in CS2 solution [9,10], which revealed the influence of the cage structure on the electronic structure of endohedral La ions. The anisotropic ESR parameters, such as A g, A a, and the quadrupole interaction, were determined. The quantitative discussion of these parameters indicated that the electronic structure of all La C could be described as La3+ C. The various values of g close to ge reflected the relative position of the low-lying orbital to that of the tt orbital of the cage. Interesting features such as extra spin dynamics other than those induced by molecular tumbling in solution were suggested for La Cg0-I and La C84-II. The line width at maximum slope u ms of the ESR spectrum was fitted to an expression of the form [15]. 

The following section contains a more detailed treatment of the theory behind the nonresonant spectroscopy of liquids. This will be followed by a description of the experimental implementation and data analysis techniques for a common OKE scheme, optical-heterodyne-detected Raman-induced Kerr-effect spectroscopy (22). We will then discuss the application of this technique to the study of the temperature-dependent dynamics of simple liquids composed of symmetric-top molecules. 

The radical breathing, in-plane graphitic G-band and disorder-induced D-band frequencies of SWNTs have been found to be dependent on temperature. A linear decrease in frequency with respect to increasing temperature has been identified. The temperature-dependent >d band for semiconducting tubes at 1565cm is 0.0226cm K. However, experimental and molecular dynamic simulation... 

CILS spectroscopy is concerned with the frequency, density, polarization, and temperature dependences of supermolecular light scattering. Pure and mixed gases are considered, that is, complexes of like and of dissimilar molecules are of interest. In Section 1.3, we consider ordinary collision-induced Raman scattering nonlinear and electronic collision-induced Raman processes are the subject of the Appendix CILS of liquid and solid samples are considered in Part II, together with molecular dynamics simulations. 

The overall dynamics of PIP in the context of dependence on the confinement size is illustrated in Fig. 11, showing the temperature dependence of the dielectric loss of PIP (Mw = 52 kg/mol) down to a him thickness smaller than the end-to-end distance of the polymer chains. The confinement-induced mode becomes faster with decreasing him thickness and approaches the segmental mode, while its relaxation strength increases at the expense of the normal mode, which decreases (Figs. 11 and 12). 

The characteristics of a reactive gas (a premixed gas) are dependent not only on the type of reactants, pressure, and temperature, but also on the flow conditions. When the flame front of a combustion wave is flat and one-dimensional in shape, the flame is said to be laminar. When the flame front is composed of a large number of eddies which are three-dimensional in shape, the flame is said to be turbulent. Unlike a laminar flame, the combustion wave of a turbulent flame is no longer onedimensional, and the reaction surface of the combustion wave is increased significantly by the fluid-dynamically induced eddies. 

A. Electron-Phonon Interaction Parameterization Scheme. In observing the fluorescence decay rate from a given J-manifold, it is generally found that the decay rate is independent of both the crystal-field level used to excite the system and the level used to monitor the fluorescence decay. This observation indicates that the crystal-field levels within a manifold attain thermal equilibrium within a time short compared to the fluorescence decay time. To obtain this equilibrium, the electronic states must interact with the host lattice which induces transitions between the various crystal-field levels. The interaction responsible for such transitions is the electron-phonon interaction. This interaction produces phonon-induced electric-dipole transitions, phonon side-band structure, and temperature-dependent line widths and fluorescence decay rates. It is also responsible for non-resonant, or more specifically, phonon-assisted energy transfer between both similar and different ions. Studies of these and other dynamic processes have been the focus of most of the spectroscopic studies of the transition metal and lanthanide ions over the past decade. An introduction to the lanthanide work is given by Hiifner (39). 

In nonhydrogen bonding solvents, this molecule was shown to emit only at 500 nm. Emission at 390 nm could only be obtained in alcohols. These results demonstrate that the ultraviolet fluorescence component is due to molecules in which the carbonyl oxygen is not hydrogen bonded to the hydroxyl group. Equilibrium cannot be established between the two tautomers in the excited state only molecules which are in the correct ground state configuration will participate in a proton translocation. This proton translocation takes place in under 10 ps. Since neither a temperature dependence nor an isotope effect could be observed, the dynamic measurements do not elucidate the mechanism for the proton translocation. This question has been answered in part by the appUcation of laser-induced fluorescence. 

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