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

Chem. J. Chinese Universities ›› 2003, Vol. 24 ›› Issue (2): 335.

• Articles • Previous Articles Next Articles

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

XU Yi-Zhuang^1,2, 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. 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

Abstract

Abstract: Strong electronic Raman bands corresponding to the transition between ⁴I_9/2 and ⁴I_11/2 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 ( ⁴I_11/2 of Nd³⁺) to the ⁴F_3/2 state and causes a significant decrease of the population of Nd³⁺ at the ⁴I_11/2 state. This renders the population ratio of Nd³⁺ at ⁴I_9/2 and ⁴I_11/2 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 ⁴I_9/2 to ⁴I_11/2. 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

CLC Number:

O657.37

TrendMD:

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]. Chem. J. Chinese Universities, 2003, 24(2): 335.

[1]	YAN Jiasen, HAN Xianying, DANG Zhaohan, LI Jiangang, HE Xiangming. Preparation and Performance of Paraffin/Expanded Graphite/Graphene Composite Phase Change Heat Storage Material [J]. Chem. J. Chinese Universities, 2022, 43(6): 20220054.
[2]	XUE Yarong, LI Hongwei, WU Yuqing. Carbon Dots Based-on Polyethyleneimines as a Ratiometric Fluorescent Sensor of Morin^† [J]. Chem. J. Chinese Universities, 2020, 41(7): 1531.
[3]	FENG Wei,WANG Bowei,JIANG Yang,LI Longyun. Design, Preparation and Surface-enhanced Raman Scattering(SERS) Spectrum of Single Ag Nanodot^† [J]. Chem. J. Chinese Universities, 2019, 40(7): 1345.
[4]	LI Wenhong,WANG Danyang,CAO Jinjin,WEI Yongju. Comparative Study of Absorption and Fluorescence Spectra of Glycitein and Glycitin^† [J]. Chem. J. Chinese Universities, 2019, 40(1): 47.
[5]	TONG Ti*, ZHAO Yangyang, FU Yilin, SHAN Guiye. Special Surface Enhanced Raman Scattering on Lung Cancer Tissues Based on Au/Cu Nanorods Substrate^† [J]. Chem. J. Chinese Universities, 2017, 38(9): 1536.
[6]	WU Xiaojing, LIU Azuan. Studies of Raman Spectra and Theoretical Calculation of MnCl₂/DMSO Solution [J]. Chem. J. Chinese Universities, 2017, 38(12): 2220.
[7]	LI Ting, CAO Zhong, LI Panpan, HE Jinglin, XIAO Hui, YANG Chan. High-sensitive Fluorescent Enhancement Detection of Hg(Ⅱ) Ions Based on Poly(thymine)-templated Copper Nanoclusters^† [J]. Chem. J. Chinese Universities, 2016, 37(9): 1616.
[8]	WANG Kai, WANG Qinglei, YAN Tingting, LIN Aolei. Raman Spectroscopic Study on High Pressure-induced Phase Transition of D,L-Mandelic^† [J]. Chem. J. Chinese Universities, 2015, 36(2): 381.
[9]	OUYANG Bing, XUE Jiadan, ZHENG Xuming. Excited State Dynamics of γ-Crotonolactone: Resonance Raman Spectroscopy and Complete Active Space Self-consistent Field(CASSCF) Study^† [J]. Chem. J. Chinese Universities, 2015, 36(10): 1995.
[10]	LIN Xiaomin, ZHU Lili, HAN Jian, LIU Xiaomei. Microstructure and Electrical Properties of Solid Electrolytes Ce_0.9Er_0.1-_xPr_x [J]. Chem. J. Chinese Universities, 2015, 36(1): 61.
[11]	YANG Youwen, ZHU Wenbin, LI Tianying, MA Dongming, CHEN Dong. Controlled Fabrication and Spectral Characterization of InSb Nanowire Arrays^† [J]. Chem. J. Chinese Universities, 2014, 35(3): 466.
[12]	LIU Chun-Yu, WANG Shao-Yan, XU Shu-Ping, XU Wei-Qing. SERS and EEM Fluorescence Spectral Distinction of Sudan Ⅰ and Paprika Red in Food [J]. Chem. J. Chinese Universities, 2013, 34(11): 2505.
[13]	HAN Bing-Xing, WU Fang-Ying. Synthesis of N,N-Dimethyl Pyridine Benzaldehyde-4-dimethylaminobenzoylhydrazone and Its Application for Selective Recognizing Cu²⁺ [J]. Chem. J. Chinese Universities, 2013, 34(11): 2483.
[14]	ZHOU Jing, LI Liang, HUANG Feng-Xian, SHEN Hong-Zhi, YANG Hang, ZHOU Qiang, WANG Wen-Quan, XU Da-Peng. In-situ Raman Spectra and X-ray Diffraction Study on Pressure-induced Phase Transition in Columbite ZnNb₂O₆ [J]. Chem. J. Chinese Universities, 2013, 34(10): 2383.
[15]	CAO Xia, ZENG Xi, MU Lan, CHEN Yi, WANG Rui-Xiao, ZHANG Yun-Qian, ZHANG Jian-Xin, WEI Gang. Synthesis, Characterization and Aggregation Induced Enhanced Emission of New Phenothiazine Hydrazone [J]. Chem. J. Chinese Universities, 2012, 33(10): 2184.

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

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments