Now showing items 251-260 of 298
Field dependence of nuclear magnetic relaxation of 119Sn in SnCl4, SnBr4, and SnI4
(The American Institute of Physics, 1974-02-01)
Longitudinal and transverse relaxation times of 119Sn have been measured as a function of temperature at several field strengths in SnCl4, SnBr4, and SnI4. T2 in all three liquids is field independent and is governed by ...
Nuclear spin relaxation due to paramagnetic species in solution: Effect of anisotropy in the zero field splitting tensor
(The American Institute of Physics, 1993-04-15)
The NMR (nuclear magnetic resonance) paramagnetic relaxation enhancement (NMR‐PRE) that is produced by paramagnetic solutes in solution has been investigated theoretically with respect to the influence of zero field splitting ...
One-dimensional exciton fusion kinetics in dilute polymer blends
(Elsevier, 1990)
Exciton-exciton and exciton-excimer triplet fusion kinetics is monitored in medium molecular weight P1VN/PMMA films with concentrations from 0.005 to 100% (weight), at temperatures of 77 to 300 K, via time-resolved ...
FT Raman and DFT Study on a Series of All- anti Oligothienoacenes End-Capped with Triisopropylsilyl Groups
(WILEY-VCH Verlag, 2009-12-07)
Herein, we study the Π-conjugational properties of a homologous series of all -anti oligothienoacenes containing four to eight fused thiophene rings by means of FT Raman spectroscopy and DFT calculations. The theoretical ...
Pattern formation in diffusion-limited reactions
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1989-03)
The conditions for macroscopic segregation of A and B in a steady-state A+B → 0 reaction are studied in infinite systems. Segregation occurs in one and two dimensions and is marginal for d =3. We note the dependence of ...
Exciton patterns in molecular dots and wires and application to polymer morphology
(Elsevier, 1991)
Time sequencing of laser excitation can control the microscopic patterns of molecular excitations (excitons) in nanometer scale molecular ensembles. This is demonstrated for isolated guest chains in polymer blends (P1VN/PMMA) ...
Intermolecular resonances, optical dephasing and relaxations in a crystalline complex
(Elsevier, 1979-01)
Singlet-triplet transition is investigated for 1,4-dibromonaphthalene: octafluoronaphthalene complex where the triplet states of the two components are in near resonance. Photo excitation, T10 absorption and phosphorescence ...
Analysis of the low temperature fluorescence and phosphorescence spectra of p-difluorobenzene
(Elsevier, 1983-11)
The low temperature fluorescence spectra (4.2 K) of solid solutions of p-difluorobenzene-h4 (pDFB-h4) and -d4 have been recorded and analyzed. The absence of fluorescence from vibrationally excited states at 4.2 K eliminates ...
Fractal to Euclidean crossover and scaling for random walks on percolation clusters. II. Three‐dimensional lattices
(The American Institute of Physics, 1985-09-15)
We perform random walk simulations on binary three‐dimensional simple cubic lattices covering the entire ratio of open/closed sites (fraction p) from the critical percolation threshold to the perfect crystal. We observe ...
The role of extra-atomic relaxation in determining Si 2pSi2p binding energy shifts at silicon/silicon oxide interfaces
(The American Institute of Physics, 1997-09-01)
The observed binding energy shift for silicon oxide films grown on crystalline silicon varies as a function of film thickness. The physical basis of this shift has previously been ascribed to a variety of initial state ...