Excitations at Interfaces

Thomas JK (1984) The chemistry of excitation at interfaces. ACS Monograph Series, No 181, American Chemical Society, Washington, D.C. 

Thomas, J. K. The Chemistry of Excitation at Interfaces ACS Monograph 181 American Chemical Society Washington DC, 198A. Ananthapadmanabhan, K. P. Goddard, E. D. Turro, N.J. Kuo,... 

J. K. Thomas, The Chemistry of Excitation at Interfaces, ACS Monograph 181, Washington, 1984. 

Figure Cl.5.4. Comparison of near-field and far-field fluorescence images, spectra and lifetimes for the same set of isolated single molecules of a carbocyanine dye at a PMMA-air interface. Note the much higher resolution of the near-field image. The spectmm and lifetime of the molecule indicated with the arrow were recorded with near-field excitation and with far-field excitation at two different excitation powers. Reproduced with pennission from Trautman and Macklin [125].

The molecular collective behavior of surfactant molecules has been analyzed using the time courses of capillary wave frequency after injection of surfactant aqueous solution onto the liquid-liquid interface [5,8]. Typical power spectra for capillary waves excited at the water-nitrobenzene interface are shown in Fig. 3 (a) without CTAB (cetyltrimethy-lammonium bromide) molecules, and (b) 10 s after the injection of CTAB solution to the water phase [5]. The peak appearing around 10-13 kHz represents the beat frequency, i.e., the capillary wave frequency. The peak of the capillary wave frequency shifts from 12.5 to 10.0kHz on the injection of CTAB solution. This is due to the decrease in interfacial tension caused by the increased number density of surfactant molecules at the interface. Time courses of capillary wave frequency after the injection of different CTAB concentrations into the aqueous phase are reproduced in Fig. 4. An anomalous temporary decrease in capillary wave frequency is observed when the CTAB solution beyond the CMC (critical micelle concentration) was injected. The capillary wave frequency decreases rapidly on injection, and after attaining its minimum value, it increases... 

FIG. 3 Power spectra for capillary waves excited at the water-nitrobenzene interface (a) without CTAB molecules and (b) 10s after injection of a CTAB solution (0.5mL, lOmM) into the water phase. 

Figure 2. Regular reflectance Replication of Snellius law for reflected and refracted radiation at interface in dependence on the refractive indices of the media adjacent to this interface, demonstrating total internal reflectance and evanescent field, exciting fluorophores close to the waveguide or even surface plasmon resonance.

Squier, J. A., Muller, M., Brakenhoff, G. J., and Wilson, K. R. 1998. Third harmonic generation microscopy. Review of dynamic imaging with THG in living organisms was first demonstrated. The point scanning source was used for THG imaging. Excitation at 1.2 (xm, 250 kHz. Interface orientation dependency in respect to the laser beam was shown in glass beats. Opt. Exp. 3 315-24. 

The term in the curly brackets describes the response at x due to the excitation at x, transmitted by the Rayleigh wave mechanism it can therefore be thought of as a kind of Green function. The results described by eqns (7.33) and (7.34) are central to the theory of the contrast from cracks and interfaces that will be presented in Chapter 12. 

Figure 41 Left panel calculated 62 first asymmetric peak (- - -) and its Gaussian fit (—) for the (a) Sip]-SiC>2, (b) Si[2]-SiC>2 and (c) S1O2 superlattices. The letter I indicates the interface Gaussian band while the letter Q indicates the bulk-like Gaussian band. Right panel PL spectra of c-Si/Si02 single quantum wells under 488 nm laser excitation at 2 K (a) 1.7 nm, (b) 1.3 nm and (c) 0.6 nm thickness. The asymmetric PL spectra can be fitted by two Gaussian bands, the weak Q band and the strong I band [51],...

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