Now showing items 271-280 of 298
Raman Phonon Spectra of Isotopic Mixed Naphthalene Crystals: Librational Exciton Model and the Amalgamation Limit
(The American Institute of Physics, 1972-07-15)
We present an experimental Raman study of lattice modes in neat and mixed (10%–90%) crystals of naphthalene‐h8 and naphthalene‐d8 at 100°K with 1 cm−1 resolution. The spectral features of the neat crystals are preserved ...
C13 and Deuterium Isotope Effects in the Photolysis of Methyl and Ethyl Bromide
(The American Institute of Physics, 1959-04)
Relative rates of formation of isotopic radicals in the photolysis of gaseous methyl and ethyl bromide have been measured. Photolyses (2537 A) were carried out in a large excess of cyclopentane. Methyl (or ethyl) radicals ...
The thermophysical properties of three globular molecules
(Elsevier, 1961-01)
The low temperature heat capacities of adamantane, hexamethylenetetramine and triethylenediamine have been determined from 5 to 350[deg]K by adiabatic calorimetry. A transition at 208.6[deg]K involving an entropy increment ...
Electron diffraction studies of supersonic jets. V. Low temperature crystalline forms of SF6, SeF6, and TeF6
(The American Institute of Physics, 1983-09-15)
Condensation of SF6, SeF6, and TeF6 in nozzle flows with inert carrier gases produces microcrystals of these materials. All form the higher temperature body‐centered cubic structure at higher partial pressures of hexafluoride. ...
Electron diffraction studies of hot molecules. III. Stretching and bending anharmonicity in CF3Cl
(The American Institute of Physics, 1984-05-01)
Bond lengths, amplitudes of vibration, and asymmetries in distribution of nonbonded atom pairs were determined for CF3Cl at temperatures ranging from 300 to 1220 K. The CF but not the CCl bond length followed the commonly ...
Rotational spectrum, structure, and modeling of the HCCH–(OCS)2HCCH–(OCS)2 trimer: Observation of a polar OCS dimer fragment
(The American Institute of Physics, 1999-12-15)
The rotational spectra of eight isotopomers of the HCCH–(OCS)2HCCH–(OCS)2 trimer have been assigned by pulsed nozzle, Fourier-transform microwave spectroscopy. The rotational constants and dipole moment components are ...
Fractal energy transport: Random walk simulations on long-range percolation clusters
(Elsevier, 1984-12)
Luminescene from naphthalene alloys is quenched by long-range exciton hops. These are modeled by long-range random walks on long-range percolation clusters with a range-dependent hopping time. Both linear and exponential ...
Hierarchies of nonclassical reaction kinetics due to anisotropic confinements
(The American Institute of Physics, 1999-01-22)
In contrast to classical chemical reaction kinetics, for diffusion limited chemical reactions the anisotropy of the geometry has far reaching effects. We use tubular two and three-dimensional spaces to illustrate and discuss ...
Random Lattice Calculations on Frenkel Excitons in Disordered Molecular Crystals—1B2u Naphthalene
(The American Institute of Physics, 1971-12-01)
Using the recently acquired exciton dispersion relations for crystalline naphthalene, we have calculated the density‐of‐states functions for heavily doped isotopic binary mixed crystals of naphthalenes with arbitrary ...
Aspherical magnetically modulated optical nanoprobes (MagMOONs)
(The American Institute of Physics, 2003-05-15)
Aspherical magnetic particles orient in a magnetic field due to magnetic shape anisotropy. They also emit different fluxes of light from their different geometric faces due to self-absorption and total internal reflection ...