摘要
以柠檬酸钠作还原剂 ,在氯化钠存在条件下 ,采用微波高压液相合成法制备了银原子团簇 ,其最强共振散射峰在 42 5nm。它是 1种非线性光学介质。当激发波长为 42 5nm( 7 0 6× 1 0 1 4 Hz)时 ,在 42 5nm ( 7 0 6× 1 0 1 4 Hz)和 85 0nm ( 1 /2× 7 0 6× 1 0 1 4 Hz)分别产生 1个最强的共振散射峰和 1个 1 /2分频分频散射峰 ;当激发波长为 60 0nm ( 5 0 0× 1 0 1 4 Hz)时 ,在30 0nm ( 2× 5 0 0× 1 0 1 4 Hz)和 90 0nm ( 2 /3× 5 0 0× 1 0 1 4 Hz)分别产生 1个 2倍频和 2 /3分频散射峰 ;当激发波长为 85 0nm ( 3 5 3× 1 0 1 4 Hz)时 ,在 2 83nm ( 3× 3 5 3× 1 0 1 4 Hz)、 42 5nm ( 2×3 5 3× 1 0 1 4 Hz)和 5 67( 3/2× 3 5 3× 1 0 1 4 Hz)分别产生 1个 3倍频、 2倍频和 3/2分频散射峰。分频散射和倍频散射峰与共振散射峰具有相似的散射行为。提出了液相银团簇的分频、和频、差频原理 。
Using sodium citrate as reducer,silver clusters in liquid has been prepared by means of microwave high pressure procedure in the presence of NaCl.It is a nonlinear scattering medium.There is a strongest resonance scattering peak at 425nm.As the excited wavelength is at 425nm(7 06×10 14 Hz),it exhibits a strongest resonance scattering peak at 425nm(7 06×10 14 Hz)and a 1/2 fraction frequency resonance scattering peak at 850nm(1/2×7 06×10 14 Hz).As the excited wavelength is at 600nm(5 00×10 14 Hz),it exhibits a double frequency resonance scattering peak at 300nm(2×5 00×10 14 Hz) and a 2/3 fraction frequency resonance scattering peak at 900nm(2/3×5 00×10 14 Hz),As the excited wavelength is at 850nm(3 53×10 14 Hz),three-times frequency resonance scattering peak at 283nm(3×3 53×10 14 Hz)?double frequency resonance scattering peak at 425nm(2×3 53×10 14 Hz) and a 3/2 fraction frequency resonance scattering peak at 567nm(3/2×3 53×10 14 Hz).The fraction frequency scattering,multiple frequency and the resonance scattering have similar scattering behavior.The principle of the fraction frequency,sum frequency and difference frequency for the clusters in liquid has been proposed,and used to explain the nonlinear scattering.
出处
《贵金属》
CAS
CSCD
2001年第3期8-13,共6页
Precious Metals
