Spin-Peierls transition in quasi-one-dimensional crystals
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Reentrant Lock-in Transition of the Charge-Density Wave in2H-TaSe2at High Pressure
High-pressure x-ray scattering studies of $2H$-Ta${\mathrm{Se}}_{2}$ reveal reentrant behavior of the charge-density-wave (CDW) lock-in transition. As pressure is increased the normal-to-incommensurate CDW transition changes less than 5 K; however, the lock-in transition, initially suppressed to $T\ensuremath{\rightar…
Enhancement of the Infrared Absorption from Molecular Monolayers with Thin Metal Overlayers
The infrared absorption from molecular monolayers is enhanced a factor of 20 by thin metal overlayers or underlayers with use of the attenuated-total-reflection technique. The total enhancement, including contributions from the attenuated-total-reflection geometry, is almost ${10}^{4}$. This effect is consistent with…
Dielectric properties of PbI2 single crystals
Dielectric constant (K), loss (tan δ), and conductivity (σ) of single crystals of PbI2 are measured (E ∥ c-axis) as a function of frequency in the range 102 to 107 Hz and at temperatures between 77 to 560 K. At room temperature (≈︁ 303 K), the K-value at 106 Hz is 6.7. The dielectric constant of this crystals increase…
Ferroelastic domains in BiVO4
The domain structure of the ferroelastic monoclinic phase of BiVO4 is examined by electron microscopy and electron diffraction methods. It consists of two orientation variants separated by two sets of quasi-mutually “perpendicular” walls. The orientation of the domain walls is not determined by symmetry but follows fr…
Cadmium–tin-oxide films deposited by dc reactive sputtering from a Cd-Sn alloy target
Cadmium–tin-oxide films with high conductivity and high visible transmission were prepared by dc reactive sputtering from a Cd-Sn alloy target in an Ar-O2 atmosphere. The electrical and optical properties of these films were found to depend strongly uponthe oxygen concentration in an Ar-O2 atmosphere during deposition…
On the rotational motion of the ammonium ion in the CsCl-type phase of NH4Br: Results from quasielastic neutron scattering
The rotational motion of the ammonium ion in polycrystalline NH4Br has been investigated by quasielastic incoherent neutron scattering at 12 different temperatures between 297 and 409 K. The measured spectra were corrected for multiple scattering and compared to the C4-rotational jump model. The elastic incoherent str…
Structure of erbium pentaphosphate
0.13 0.3224 (3) 0.2508 (3) 0.2405 (3) 0.38 0.1496(3) 0.1682(3) 0.1030(3) 0.13 0.0253 (3) 0.3488 (3) 0.0324 (3) 0.18 -0.1820 (3) 0.3628 (3) 0.1089 (3) 0.10 -0.3535 (3) 0.4659 (3) -0.0016 (3) 0.29 0.3694 (9) 0.1500 (8) 0.2690 (8) 0.93 0.5598 (8) -0.0968 (8) 0.1330 (7) 0.55 0.4747 (8) 0.1018 (8) 0.0745 (8) 0.84 0.3469 (8…
Raman and fluorescent scattering by molecules embedded in dielectric spheroids
Fluorescent and Raman scattering by molecules embedded in dielectric particles is strongly dependent on the morphology and optical properties of the particle, the distribution of active molecules within the particle, and, in the case of nonspherical particles, orientation. The model previously applied to spheres and c…
Melting in two dimensions: Determination of phase transition boundaries
Molecular dynamics computations are reported for systems of soft repulsive discs of the inverse twelfth-power potential and for Lennard-Jones atoms in two dimensions. In the case of soft discs the melting transition is obtained by assuming a first-order transition and subsequent application of Ross’s melting rule. The…
Enhanced Raman scattering at the surface (SERS) of a spherical particle
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text D.-S. Wang, H. Chew, and M. Kerker, "Enhanced Raman scattering at the surface (SERS) of a spherical particle," Appl. Opt. 19, 2256-2257 (1980) Export C…
Crystal-field analysis of triply ionized rare earth ions in lanthanum trifluoride. II. Intensity calculations
Implementation of the Judd–Ofelt theory of induced electric dipole transitions is considered for rare-earth ions in LaF3. Parameters in the theory are derived a priori. Calculations of the multiplet-to-multiplet line strengths, lifetimes, branching ratios, and line-to-line squared matrix elements are performed between…
Electrostatic interactions and staging in graphite intercalation compounds
The nonlinear Thomas-Fermi equations which describe the screening of intercalant layers in graphite intercalation compounds are solved analytically in the approximation that the graphite $c$-axis band dispersion is neglected. The total energy of the system of charged intercalant layers and the self-consistent charge d…
High-quality transparent conductive indium oxide films prepared by thermal evaporation
Highly transparent (over 90% transmission in the visible range) and highly conductive (resistivity ≃2×10−4 Ω cm) indium oxide (undoped) films have been produced by thermal evaporation from an In+In2O3 source in a vacuum chamber containing low pressures of O2. These properties are comparable or superior to the best tin…
Electrical conductivity of a graphite layer
The electrical conductivity of a charged layer of graphite is calculated from first principles within a tight-binding framework. The Fermi surface consists of circles around the $P$ points in the Brillouin zone. In the neighborhood of these points we obtain analytical expressions for the electron-phonon coupling ${g}_…
Electrical transport in doped polyacetylene
The results of an experimental study of electrical conductivity and thermopower in doped polyacetylene are reported. Included are measurements on both as-grown and partially oriented films doped with iodine and AsF5; [CH(AsF5)y]xand [CH(I3)y]x, where y covers the full doping range. The data indicate three important co…
Light transmission in window-leaved plants
Window-leaved plants are succulent plants which possess areas of clear epidermis on their leaves. The underlying water storage tissue is transparent to allow light penetration to the internal chlorenchyma. The most highly evolved window-leaved plants with the most transparent tissue grow completely underground in dese…
Thermochemical ablation of tantalum carbide loaded carbon-carbons
A thermochemical ablation model for tantalum carbide loaded carbon-carbons is developed assuming phase equilibrium at the ablating surface with the simplified form of the surface energy balance employing the transfer coefficient approximation for unity Lewis number. The model also utilizes the fail temperature concept…
Elastic and inelastic scattering of electrons by Na
Utilising a crossed-electron-beam-metal-atom-beam scattering technique differential excitation cross sections at 10, 20, 40 and 54.4 eV incident energies and at scattering angles ranging from 10 to 120 degrees have been measured for the following transitions: (i) elastic scattering, and (ii) excitation from ground sta…
Mirror electron microscopy applied to the continuous local measurement of work-function variations
In surface studies, the mirror electron microscope (MEM) can give a picture of electrical and geometrical roughness and simultaneously a continuous measurement of local work-function changes Delta phi ; however, no critical study has been done on the accuracy of such a measurement. Using the MEM, the authors developed…