高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (2): 335.

• 研究快报 • 上一篇    下一篇

钕的电子拉曼光谱和一种新的拉曼增强机理

徐怡庄1,2, 吴瑾光1, 孙文秀1, 陶栋梁1, 宋增福3, 翁诗甫1, 许振华1, 徐端夫2, 徐光宪1   

  1. 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
  • 收稿日期:2002-09-30 出版日期:2003-02-24 发布日期:2003-02-24
  • 通讯作者: 徐怡庄(1967年出生),男,博士,副教授,从事分子光谱和稀土功能材料研究.E-mail:xyz@pku.edu.cn E-mail:xyz@pku.edu.cn
  • 基金资助:

    国家重点基础研究发展规划项目(批准号:G1998061307);国家自然科学基金(批准号:50203001,29901002,29671002,39730160,20023005,59733060,59873030,59953001,59903008);中国科学院知识创新工程(批准号:KJCX1-Y-03)

Electronic Raman Bands of Neodymium and a New Mechanism for Raman Enhancement

XU Yi-Zhuang1,2, WU Jin-Guang1, SUN Wen-Xiu1, TAO Dong-Liang1, SONG Zeng-Fu3, WENG Shi-Fu1, XU Zhen-Hua1, XU Duan-Fu2, XU Guang-Xian1   

  1. 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
  • Received:2002-09-30 Online:2003-02-24 Published:2003-02-24

关键词: 拉曼光谱, 钕, 反馈, 增强

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.

Key words: Raman spectrum, Neodymium, Feed-back, Enhancement

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