کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9770386 | 1501947 | 2005 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Correlation spectroscopy based on non-linear response of silver colloids (including SEHRS)
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
The correlation curves of both types of colloid show one step (Ï1/2â¼10 ms) which can be associated with lateral diffusion of the individual particles. Its Ï1/2-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 Ï1/2-value is, however, essentially the same for all samples investigated (Ïâ²1/2â¼50 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).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volumes 735â736, 14 February 2005, Pages 85-102
Journal: Journal of Molecular Structure - Volumes 735â736, 14 February 2005, Pages 85-102
نویسندگان
G. Brehm, G. Sauer, N. Fritz, S. Schneider, S. Zaitsev,