| 钕的电子拉曼光谱和一种新的拉曼增强机理 |
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| 引用本文： | 徐怡庄,吴瑾光,孙文秀,陶栋梁,宋增福,翁诗甫,许振华,徐端夫,徐光宪. 钕的电子拉曼光谱和一种新的拉曼增强机理[J]. 高等学校化学学报, 2003, 24(2): 335-336 |
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| 作者姓名： | 徐怡庄 吴瑾光 孙文秀 陶栋梁 宋增福 翁诗甫 许振华 徐端夫 徐光宪 |
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| 作者单位： | 1. 北京大学化学与分子工程学院, 稀土材料化学及应用国家重点实验室, 北京 100871;2. 中国科学院化学研究所, 北京 100080;3. 北京大学物理系, 北京 100871 |
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| 基金项目： | 国家重点基础研究发展规划项目 (批准号 :G19980 6 130 7)，国家自然科学基金 (批准号 :5 0 2 0 30 0 1,2 990 10 0 2 ,2 96 710 0 2 ,39730 16 0 ,2 0 0 2 30 0 5 ,5 97330 6 0 ,5 98730 30 ,5 995 30 0 1,5 990 30 0 8)，中国科学院知识创新工程 (批准号:KJCX1-Y-0 3) |
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| 摘 要： | 拉曼光谱是研究分子体系微观结构的一种有力工具 [1] ,由于拉曼信号弱 ,在一定程定上影响了拉曼光谱的应用 .为解决此问题 ,人们一方面采用各种先进的光谱测试技术 ,另一方面广泛运用各种拉曼增强机理 ,以提高拉曼光谱的灵敏度 .到目前为止 ,公认的拉曼增强机理只有共振拉曼增强和表面拉曼增强两种 .最近 ,文献报道了一种称为聚集增强的拉曼增强机理[2 ] .众所周知 ,f电子使稀土具有极丰富的电子能级结构 ,使得稀土元素在发展各种高性能的功能材料方面具有巨大的潜在价值 [3～ 5] .人们利用稀土的能级结构发展各种探针技术以表征分子体系在…
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| 关 键 词： | 拉曼光谱 钕 反馈 增强 |
| 文章编号： | 0251-0790(2003)02-0335-02 |
| 收稿时间： | 2002-09-30 |
Electronic Raman Bands of Neodymium and a New Mechanism for Raman Enhancement |
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| XU Yi-Zhuang ,,WU Jin-Guang ,SUN Wen-Xiu ,TAO Dong-Liang ,SONG Zeng-Fu ,WENG Shi-Fu ,XU Zhen-Hua ,XU Duan-Fu ,XU Guang-Xian. Electronic Raman Bands of Neodymium and a New Mechanism for Raman Enhancement[J]. Chemical Research In Chinese Universities, 2003, 24(2): 335-336 |
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| Authors: | XU Yi-Zhuang WU Jin-Guang SUN Wen-Xiu TAO Dong-Liang SONG Zeng-Fu WENG Shi-Fu XU Zhen-Hua XU Duan-Fu XU Guang-Xian |
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| Affiliation: | 1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;3. Department of Physics, Peking University, Beijing 100871, China |
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| Abstract: | Strong electronic Raman bands corresponding to the transition between 4I9/2 and 4I11/2 manifolds of Nd3+ are observed in the FT-Raman spectrum of neodymium complex because of the Raman enhancement effect. Neither resonant enhancement nor surface enhancement accounts for the Raman enhancement observed here. We propose a new mechanism of Raman enhancement(Feed-bach Raman Enhancement): the YAG laser excites the final state of Raman transition ( 4I11/2 of Nd3+) to the 4F3/2 state and causes a significant decrease of the population of Nd3+ at the 4I11/2 state. This renders the population ratio of Nd3+ at 4I9/2 and 4I11/2 deviates from the value required by the Boltzmann′s law. To restore equilibrium, Raman scattering is enhanced so that more Nd3+ ions are brought from 4I9/2 to 4I11/2. This hypothesis gets support from the temperature-variable FT-Raman spectroscopic results. Additionally, obvious differences between Stokes and Anti-stokes Raman spectrum of Nd3+ support our mechanism too. |
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| Keywords: | Raman spectrum Neodymium Feed-back Enhancement |
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