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- W1999771330 abstract "The non-linear response (second harmonic generation, SHG, hyper-Rayleigh scattering, HRS, surface-enhanced hyper-Raman scattering, SEHRS, and continuum generation) of two different types of silver colloids is compared by stationary and correlation spectroscopy. Employing a poly-disperse colloid prepared after the protocol of Lee and Meisel we found that the efficiency of all types of non-linear response is greatly enhanced if the colloid is ‘activated’ by addition of chloride ions. This activation is also necessary to observe SEHRS with both the Lee-Meisel and the mono-disperse colloid prepared by hydrazine reduction. The correlation curves of both types of colloid show one step (τ1/2∼10 ms) which can be associated with lateral diffusion of the individual particles. Its τ1/2—value is larger for the poly-disperse colloid, which contains larger particles. In addition, we find a second step, its relative amplitude being dependent on experimental parameters, whose τ1/2—value is, however, essentially the same for all samples investigated (τ′1/2∼50 μs). We assign this correlation time to processes that lead to a restructuring of the surface and the formation and destruction of so-called ‘hot spots’. Under optimum condition, the efficiency for all non-linear processes connected with one such ‘hot spot’ is extremely high. ‘Hot particles’ contain at least one hot spot and can therefore dominate the non-linear signal without the need of aggregation (field enhancement in the gap between particles)." @default.
- W1999771330 created "2016-06-24" @default.
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- W1999771330 date "2005-02-01" @default.
- W1999771330 modified "2023-09-26" @default.
- W1999771330 title "Correlation spectroscopy based on non-linear response of silver colloids (including SEHRS)" @default.
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- W1999771330 doi "https://doi.org/10.1016/j.molstruc.2004.11.026" @default.
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