Scattered resonance light

While neat-resonant light exerts both scattering forces and dipole forces on single atoms, similar forces ate also exerted on larger dielectric objects. 

Parkash, J., J.H. Robblee, J. Agnew, E. Gibbs, P. Collings, R.F. Pasternack, and J.C de Paula. 1998. Depolarized resonance light scattering by porphyrin and chlorophyll a aggregates. Biophys. J. 74 2089-2099. 

Liu RT, Yang JH, Sun CX et al (2003) Study of the interaction of nucleic acids with acridine orange-CTMAB and determination of nucleic acids at nanogram levels based on the enhancement of resonance light scattering. Chem Phys Lett 376 108-115... 

Figure 1.16 Critical issues facing DNA microarrays and protein microarrays. MIAME = minimum information about a microarray experiment, checklist endorsement as of October 14, 2002. RCA = rolling circle amplification. RLS = resonance light scattering.

Figure 6.23 Resonance light scattering. (From Yguerabide, J. and Yguerabide, E.E., Anal. Biochem., 262, 137-156 and 157-176, 1998. With permission.)...

Absorption resonances resulting from excitation of surface modes are accompanied by scattering resonances at approximately the same frequencies this was pointed out following (12.26). In most experiments transmission is measured to determine extinction, which is nearly equal to absorption for sufficiently small particles. However, surface mode resonances have been observed in spectra of light scattered at 90° by very small particles of silver, copper, and gold produced by nucleation of vapor in an inert gas stream (Eversole and Broida, 1977). The scattering resonance peak was at 3670 A, near the expected position of the Frohlich mode, for the smallest silver particles. Although peak positions were predictable, differences in widths and shapes of the bands were concluded to be the result of nonsphericity. 

Atabek, O., Lefebvre, R., and Jacon, M. (1980a). Continuum resonance Raman scattering of light by diatomic molecules. I. The role of radiative crossings between the potentials of the dressed molecule, J. Chem. Phys. 72, 2670-2682. 

Rousseau, D.L. and Williams, P.F. (1976). Resonance Raman scattering of light from a diatomic molecule, J. Chem. Phys. 64, 3519-3537. 

Up to this point, we have been considering the absorption properties of Au nanoparticles and the significance of Cabs in colorimetric or photothermal applications. However, colloidal Au particles are also famous for resonant light scattering, which depends on CJca.109,110 The earlier description of C, is dominated by Cabs and intended only for smaller nanospheres (r < 20 nm). Cext is more correctly described as the sum of Cabs + Csca ... 

In the process of scattering and absorption, the electric component of the incident wave excites the vibrations of the oscillator. Under the effect of this component the electron performs forced vibrations. If the eigenfrequency ojq of the oscillator coincides with that of the light wave u>i, resonance absorption is observed. If these frequencies do not coincide, we have non-resonant scattering of light. 

At the opposite limit yn < ye, sparsely distributed resonant domains scatter the light in all directions of space and the specular reflection becomes negligible. (In the case where y, > ynr, the condition of weak specular reflection becomes r0 < An.) This behavior of the resonant reflection optical response should be observable for real systems as a function of the temperature, ynr(T) being70,127 a rapidly growing function of T see Fig. 4.4. 

Pasternack RF, Schaefer KF, Hambright P (1994) Resonance light-scattering studies of porphyrin diacid aggregates. Inorg Chem 33 2062-2065... 

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