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Resonance Scattering Spectra for Silver Clusters by Density Matrix Procedure
Author(s): JIANG Zhiliang, LI Fang
Pages: 93-
98
Year: 2001
Issue:
2
Journal: GUANGXI SCIENCES
Keyword: 银原子团簇; 非线性共振散射; 密度矩阵法;
Abstract: 以银原子团簇(主)共振散射峰作为共振散射光谱分布理论研究模型,采用密度矩阵法研究液相银原子团簇(主)共振散射峰(7.06×1014Hz,425 nm)和1/2分频共振散射峰(1/2×7.06×1014Hz,850 nm)的频率和强度分布.银原子团簇(r=12 nm)溶液呈黄色,在415 nm处有1个吸收峰;在470 nm处产生吸收谷,在485 nm处产生吸收峰,最大共振散射波长为425 nm(×1014Hz).当λex=425 nm时,在425 nm处产生1个主共振峰,在850 nm(1/2×1014Hz)处产生1个1/2分频共振峰.对于不同浓度的银原子团簇(0~1.0×10-5mo1/LAg),两散射峰的半峰宽度之比(△λ)425/(△λ)850=2/3,其散射光强度之比I425/425/I425/850≈3/1.在理想条件(真空)下,理论推导出共振散射光中心峰带与两边峰带谱线的强度比为1/3;中心峰与边峰的高度比为3:1;边峰宽与中心峰宽之比为3:2.
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