金原子团簇的共振散射光强度函数研究
A Study on the Intensity Function of Scattering Light for Au Clusters in Liquid
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摘要: 金原子团簇在320 nm，470 nm，580 nm，720 nm处产生4个共振散射峰.它是一种非线性光学介质，当入射光的频率γ不同时可获得金原子团簇的2γ倍频、γ/2分频、γ/3分频、2γ/3分频散射峰.探讨了影响散射光信号强度I(λ)的主要因素即散射光能量分布、强度分布比率、粒径 d、Δλ(λex-λ)和散射光辐射度.建立了一个合理的金原子团簇的共振散射光强度函数.Abstract: The Au clusters in liquid exhibit four resonance scat t ering peaks at 320 nm ,470 nm, 580 nm and 720 nm. It is a nonlinear optical medi um. A 1/2 fraction frequency scattering peak at 580 nm（1/2×1.03×1015 Hz） and a 1/3 fraction frequency scattering peak at 870 nm（1/3×1.03×101 5 Hz） were obtained as the excited wavelength at 290 nm(1.03×1015 Hz) . When the excited wavelenth is at 580 nm（5.02×1014 Hz）, a double fre quency scattering peak at 290 nm(2×5.02×1014 Hz) and a 2/3 fraction fre quency scattering peak at 870nm（2/3×5.02×1014 Hz） display. When the e xcited wavelength is at 870 nm（3.34×1014 Hz）, a three-times frequency scattering peak at 290 nm(3×3.34×1014 Hz) and a 3/2 fraction frequency scattering peak at 580 nm（3/2×3.34×1014 Hz）.The influence of the sca ttering light energy, ratio of intensity distribution, diameter, Δλ（λ ex-λem） and the spectral radiance of scattering Rλex emitted by the clusters on scattering signal I（λ）has been considered. A reasonable scattering light intensity function for Au clusters in liquid has b een proposed.
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