Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced resonance Raman spectroscopy of Rhodamine 6G adsorbed on colloidal silverPeter Hildebrandt and Manfred StockburgerCite this: J. Phys. Chem. 1984, 88, 24, 5935–5944Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Publishe…
The room-temperature structure of ferroelectric dicalcium lead propionate, DLP, has been determined: it is tetragonal with space group P4 1 (C 4 2 ) or P4 3 (C 4 4 ) with a=12.510(3) AA, c=17.314(2) AA, z=4. One of the six independent propionate groups in the structure is found to have its methyl carbon statistically…
The apparently large long-time-tail contribution to the stress-tensor autocorrelation function observed in computer simulations is explained on the basis of a generalized modecoupling theory. This theory includes effects that occur on a molecular length scale where structural relaxation is important. These structural…
Positive muons were injected into both trans- and cis-${(\mathrm{CH})}_{x}$ as well as ${(\mathrm{CD})}_{x}$. A marked difference was found in the field dependence of the muon spin-relaxation functions between cis- and trans-polyacetylene. A quantitative explanation was obtained by considering the unpaired electron pr…
Below 160 K, crystalline ${\mathrm{Na}}_{2}$[Fe${(\mathrm{CN})}_{5}$NO] \ifmmode\cdot\else\textperiodcentered\fi{} 2${\mathrm{H}}_{2}$O is transformed into an extremely longliving metastable state ($\ensuremath{\tau}>{10}^{7}$ sec) by irradiation with 400-540-nm light. At $T>160$ K and by irradiation with red li…
Energies of N equivalent electrons expressed in terms of two-electron energies and independent three-electron parameters: a new complete set of orthogonal operators. II. Application to 3dN configurations, P H M Uylings, A J J Raassen, J F Wyart
Reports resistivity measurements along the high-conductivity axis of Per 2 Pt(mnt) 2 , Per 2 Pd(mnt) 2 and Per 2 -Au(mnt) 2 . At low temperatures a clear metal-insulator phase transition is observed at 6.5K and 28K, respectively for the first two salts, while it appears very gradually for the Au salt. The X-ray study…
Amorphous films of a photochromic spiropyran containing a mesogenic group melt, when exposed to heat together with irradiation, to yield a red fluid. This fluid contains aggregates of merocyanine molecules and exhibits marked contraction under light illumination. The mechanism of the photocontraction is dependent upon…
One of the contributions to the enthalpy of formation ΔH of substitutional metallic solid solutions is the elastic energy due to atomic size mismatch between solute and solvent. Starting with a formula due to Eshelby and valid in the dilute regime, a multi-step process is derived which permits to generalize Eshelby's…
We discuss properties of bound magnetic polarons in an antiferromagnetic semiconductor placed in an external magnetic field. When the strength of the exchange coupling between the electron spin and local moments is increased, there can be an abrupt transition between a large and a small bound magnetic polaron. Associa…
Starting with electron energies above a few keV, all materials show an increase in the number of secondary and backscattered primary electrons with decreasing primary energy. The number of secondary plus backscattered electrons becomes equal to the number of primaries at two energies called the first and second crosso…
Initial exposure of single-crystal graphite samples to lithium vapor from a molecular beam source results in no long-range order in the lithium overlayer as observed by low-energy electron diffraction over the temperature range 80-500 K and coverage range 0.01-5 monolayers. A hexagonal close-packed incommensurate stru…
Shifts in the optical-absorption edges induced by band-gap illumination and annealing under pressure have been studied for ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ and Se. Both materials, if annealed at 1 atm beforehand, undergo a decrease in the band-gap energy with illumination under pressure. This decrease is accompan…
The fact that the optical characteristics of thin-film materials are generally different from those of the same materials in bulk form is well known. The differences depend very much on the conditions in which the deposition has been carried out. A good understanding of these differences, their causes, and the influen…
A new in situ combined electrochemistry and x-ray photoelectron spectroscopy (XPS) technique using solid polymer electrolytes has been used to characterize electrically conducting films of polypyrrole perchlorate. The technique allows in situ electrochemical oxidation and reduction (doping and undoping) in ultrahigh v…
The first physical-property measurements on laser-quenched amorphous Si are reported. The form of the vibrational spectrum and degree of structural order have been obtained by depolarized-Raman-scattering measurements. A thin layer prepared by 700-psec pulses of 3567-\AA{} radiation is found to have a bond-angle varia…
The effect of x-ray irradiation on the absorption and luminescence spectra of KDP, DKDP, and ADP has been investigated. σ-Polarized absorption bands at 390 and 550 nm are induced by low temperature irradiation in the three crystals. A π-polarized band has also been observed in KDP and DKDP peaked at 510 and 550 nm, re…
A theory describing the double-carrier injection and recombination in thin insulating crystals is developed and applied to the case of current flow in anthracene. The diffusion-free analysis indicates that the scaling J∝V2/d3 holds, even when recombination effects are present for any crystal thickness. The same scalin…
The optical constants of evaporated MgF2 films were determined over the 1050–1600-Å wavelength range from measured transmittance and near-normal incidence reflectance measurements. The complex refractive index was studied as a function of film deposition conditions and correlated with microstructural examinations by t…
A small-angle x-ray diffraction study using synchrotron radiation of paraffins ${\mathrm{C}}_{n}{\mathrm{H}}_{2n+2}$ with $19\ensuremath{\le}n\ensuremath{\le}27$ as a function of the temperature allowed us to characterize the molecular disorders of the rotator phases, associated with longitudinal molecular motions and…