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  • 1
    Electronic Resource
    Electronic Resource
    Resolution of uniaxial optical anisotropy in thin films (1986)
    s.l. : American Chemical Society
    Langmuir 2 (1986), S. 245-247 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00068a023
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  • 2
    Electronic Resource
    Electronic Resource
    Selective observation of concentration gradients by the laser beam deflection sensor applied to in situ electrochemical studies. A novel approach (1986)
    s.l. : American Chemical Society
    Analytical chemistry 58 (1986), S. 239-242 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00292a059
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  • 3
    Electronic Resource
    Electronic Resource
    Raman scattering by high-density dispersions. I. Formulation of theory and application to a pair of coated particles (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7758-7770 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The methods developed in our earlier papers, dealing with Raman scattering from small isolated, spherical particles, uniformly coated with radially uniaxial molecules, are extended to include scattering driven by applied multipolar fields. Such fields are generated by the action of the incident electromagnetic radiation on extraneous material, such as other particles belonging to the same high-density dispersion. In this paper we treat inelastic scattering associated with the Raman dipole matrix elements of the adsorbed molecules ignoring other contributions. Analytical expressions are developed for calculating the primary Raman–Stokes moments given the amplitudes of the applied multipolar fields. As a test of the practicability of the procedure, a full calculation for parallel polarization has been performed for two identical contacting, CO-coated Ag particles oriented with their line of centers parallel to the direction of polarization of the incident radiation. For this case, the effect of interparticle coupling is to broaden and intensify the excitation spectrum, extending the region of intense Raman scattering to much lower frequencies. Intensity enhancements approaching 106 are calculated for frequencies as low as 80% of the single-particle surface-plasmon resonance frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462374
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  • 4
    Electronic Resource
    Electronic Resource
    On the modeling of the self-polarizing field for a coating of point polarizable species on an isotropic dielectric sphere (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 7678-7682 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Our previous model dealing with the optical properties of small uniformly coated spheres is used iteratively to give the effective polarizability for homogeneous isotropic dielectric spheres and compared with results predicted by the Lorentz expression. Better agreement with the Lorentz expression is obtained using a modification of the model used to evaluate the self-polarizing field for the coating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458205
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  • 5
    Electronic Resource
    Electronic Resource
    Optical properties of molecules forming a uniform, uniaxial layer on a small, isotropic sphere (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 556-569 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This project was inspired by the widespread use of the properties of coated spheres in modeling the dielectric and spectroscopic behavior, including surface enhanced Raman spectroscopy, of a variety of dispersed systems. In this paper the self-polarizing contributions to the absorption and elastic scattering properties of a coated sphere are obtained in the large wavelength limit, or dipole approximation, in which the coating is treated as a polarizable, uniaxially anisotropic, shell with the local optic axis directed radially. Numerical calculations for CO on Ag are provided to illustrate some of the phenomena predicted by the equations. Of particular interest are the dependence of the absorption band for CO stretch upon particle size, surface coverage, and molecular orientation, and the dependence of the surface plasmon resonance absorption on particle size and coverage. Some limitations of the model are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456507
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of Raman scattering from local and coupled surface phonon modes of small uniformly coated spheres (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 713-728 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Building on our recent paper on the optical properties of molecules forming a uniform, uniaxial layer on a small isotropic sphere, the present paper extends the treatment to include Raman scattering from both local modes and the coupled or surface phonon modes of such a system. As with the earlier paper, the treatment is restricted to the large wavelength approximation. While Raman inactive molecular modes can result in Raman active phonon modes, the present paper considers only those Raman active phonon modes that are connected with Raman active molecular modes. For such phonon modes, the field enhancement factors for the scattered wave are identical in form to those for the incident wave, derived in our recent paper, but differ significantly from those for local modes. Calculations are presented for CO and benzene on silver particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456150
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  • 7
    Electronic Resource
    Electronic Resource
    Surface phonon induced Raman scattering: A new mechanism for intense inelastic scattering (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3861-3874 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper forms the third in a series on the optical properties of a system consisting of a uniform, radially uniaxial coating of molecules on a small isotropic sphere. In this paper, the induction of Raman activity in a coated metal sphere by the fields generated by the coupled surface phonon modes of the coating is considered. Thus, the surface phonon modes induce surface plasmons in the metal that result in its polarizability being modulated. The phenomenon, which requires dipole active rather than Raman active molecular modes to be operative, we have termed surface phonon induced Raman scattering (SPIRS). Scattering intensities predicted via SPIRS and surface enhanced Raman scattering (SERS) have been compared for CO on a spherical silver particle. That for SPIRS is found to be of the order of or greater than that for SERS, depending on exactly how the surface region of the metal sphere is modeled. Some predictions based on SPIRS are reminiscent of data previously assigned to SERS but not explained by current models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455792
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  • 8
    Electronic Resource
    Electronic Resource
    Dual-beam laser deflection sensor (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1740-1743 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact, dual-beam laser deflection system was built, mainly from commercially available parts. While the detector and electronics yielded noise levels at the theoretical level for the detector, pointing instability of the laser led to an increase in noise by a factor of about 103. The dual-beam arrangement gave only a factor of about 4 improvement over the single-beam mode due to alignment and drift problems. Further improvement requires a feedback system to minimize signal arising from common-mode beam displacements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138135
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  • 9
    Electronic Resource
    Electronic Resource
    Extensions of the Kramers–Kronig transformation that cover a wide range of practical spectroscopic applications (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5468-5478 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Kramers–Kronig (KK) transformation has been widely used for the determination of the spectra of the refractive and absorption indices from the normal-incidence reflectivity spectrum of solids. This paper considers the extension of this technique to s-polarized light at nonnormal incidence with a transparent incident medium of arbitrary, constant refractive index. While the KK transformation is known to be inapplicable under certain circumstances, we show that in all cases satisfactory corrections can be applied, and readily applied in most cases. As an example, for the experimentally important case of attenuated total internal reflection from an organic liquid in the infrared, only one additional piece of information is required, namely, the refractive index at a frequency where the absorption is low. The procedures are demonstrated using model systems consisting of sets of damped harmonic oscillators. All the KK transformations were done using the FT software of a commercial Fourier transform infrared spectrometer in order to demonstrate the considerable potential of this approach to the routine determination of optical constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449863
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  • 10
    Electronic Resource
    Electronic Resource
    Raman scattering by high-density dispersions. III. Calculation of Raman intensities for molecules physisorbed on linear chains of spherical particles (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 197-203 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In parts I and II of this series, the dominant role of "primary'' Raman moments of degree greater than one, to Raman intensities for molecules forming a uniform coating on pairs of spherical particles in close proximity, is demonstrated. In this paper, the effect of chain length, coverage, particle size, and separation, and the location of the particle in the chain on the intensity are explored for linear chains of coated particles. Intensity enhancements calculated for visible excitation are up to 30 times those for two particles, being ∼4×106 for infinite chains of silver particles of radius 25–50 A(ring) separated by the thickness of a layer of CO ∼105 for platinum and ∼104 for germanium chains. Furthermore, the enhancement for chains falls off appreciably more slowly with particle separation. Graphs of intensity vs coverage vary greatly in shape depending on particle size, molecular size, and polarizability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466979
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