Now showing items 1-10 of 16
Vibrational analysis of crystalline diketopiperazine--II. Normal mode calculations
(Elsevier, 1984)
Based on our Raman and i.r. [1] data and assignments for DKP and five of its isotopic derivatives, we have refined an intramolecular force field in a non-redundant basis. This analysis shows that the cis peptide group may ...
Observation of coupled quasi-two-dimensional electronic excitations in tilted magnetic fields
(Elsevier, 1988)
We report on a magneto-Raman scattering investigation of free and donor-bound electrons in GaAs/AlxGa1-xAs quantum wells. For fields perpendicular to the layers, the spectra show intersubband transitions of photoexcited ...
Raman and normal mode studies of the polypeptide chain conformations in crystalline magnesium and calcium poly(-glutamate)s
(Elsevier, 1985)
An analysis of the Raman spectra of dry crystalline magnesium and calcium poly(-glutamate)s, based on a normal mode calculation of [alpha]-helical poly(-glutamate), shows that the polypeptide chains in both salts have an ...
Surface enhanced raman spectroscopy of halide ions on colloidal silver: morphology and coverage dependence
(Elsevier, 1983-01-02)
Transmission electron microscopy shows that the colloidal silver used as a substrate for surface enhanced Raman spectroscopy consists of 75-135 A average diameter faceted crystals, which can be made to aggregate in clusters ...
Electromagnetic effects in the Surface Enhanced Raman Scattering from a molecule at a liquid Hg surface
(Elsevier, 1981-09-02)
In a previous publication the image enhancement effect and the enhanced radiation due to near field excitation of surface roughness were calculated for a finite-size molecule above a metal described by a nonlocal dielectric ...
Vibrational force field and normal mode analysis of N,N-dimethylacetamide
(Elsevier, 1989)
A simple general valence force field has been refined for N,N-dimethylacetamide which includes both in-plane and out-of-plane modes. This force field gives good agreement between observed and calculated frequencies for ...
Vibrational analysis of cyclo(-Ala--Ala) in two crystalline forms. Effect of structure on peptide group and CH modes
(Elsevier, 1988)
Cyclo(-Ala--Ala) has been found by X-ray diffraction to crystallize in two forms with different hydrogen bond patterns and strengths and different conformations of the C[alpha]H[alpha]C[beta]H3 group. We have done a ...
Surface enhanced raman spectroscopy of halide ions on colloidal silver: simulation of silver-halide ion spectra
(Elsevier, 1983-01-02)
The surface enhanced Raman spectra of halide ions adsorbed on colloidal silver surfaces can be explained by an interacting dipole model of a discrete adsorbate superlattice. Both (100) and (111) surfaces have been modeled, ...
Electromagnetic effects on a molecule at a metal surface : I. Effects of nonlocality and finite molecular size
(Elsevier, 1981-08-02)
The electromagnetic effects on a molecule near a metal surface are considered with the view to understanding the surface-enhanced-Raman-scattering (SERS) effect. The image enhancement effect is calculated including the ...
Vibrational analysis of 2,3-dichlorobutanes
(Elsevier, 1983)
Using intensity changes from liquid to solid for meso- and racemic-2,3-dichlorobutanes, and preliminary normal mode calculations based on a force field for secondary chlorides, we have been able to identify the bands ...