| 吸附在活性炭、三氧化二铝和硅胶上分子的核弛豫研究 |
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| 引用本文： | 薛毅,孔渝华.吸附在活性炭、三氧化二铝和硅胶上分子的核弛豫研究[J].波谱学杂志,1994,11(2):133-140. |
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| 作者姓名： | 薛毅 孔渝华 |
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| 作者单位： | 1. 中国科学院武汉物研究所波谱与原子分子物理国家重点实验室, 武汉 430071;2. 湖北省化学研究所, 武汉 430074 |
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| 摘 要： | 本文提出核与电子偶极相互作用和自旋扩散两种作用在被吸附到固体多电子表面上的分子弛豫起着重要作用,给出了自旋晶格弛豫时间(T1e)和相关时间(τc)的关系:T1e,-kτc/1+ω02τc2)1/2,式中k对给定固体是常数。吸附在硅胶上甲苯的弛豫数据可用此式描述。得到了甲苯中甲基在不同温度下的τc。,它们在374K到240K间的相关时间在3.56×10-9 s到5.76×10-8 s范围。由此计算出其活化能为15.0kJ/mol。
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| 关 键 词： | MIR物理吸附 纵向弛豫 自旋扩散 |
| 收稿时间： | 1993-03-01 |
NUCLEAR RELAXATION STUDIES OF MOLECULES PHYSISORBED ON CHARCOAL,ALUMINA AND SILICA GEL |
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| Xue Yi,Du Youru,Ye Chaohui,Kong Yuhua.NUCLEAR RELAXATION STUDIES OF MOLECULES PHYSISORBED ON CHARCOAL,ALUMINA AND SILICA GEL[J].Chinese Journal of Magnetic Resonance,1994,11(2):133-140. |
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| Authors: | Xue Yi Du Youru Ye Chaohui Kong Yuhua |
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| Institution: | 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics. The Chinese Academy of Sciences, Wuhan 430071;2. Hubei Institute of Chemistry, Wuhan 430074 |
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| Abstract: | Electron-nuclear dipolar interaction and spin-diffusion play very important roles in the relaxation processes of molecules adsorbed on solids containing surface eleetrons, such aS charcoal,alumina and silica gel.According to this relaxation rnechanism,the relation between spin-lattice relaxation time(T1e)and correlation tim-(τc)was obtainted:T1e,-k(τc/1+ω02τc2)1/2,k is a con-stant for a given solid. It was found that the relaxations of toluene adsorbed on silica gel were interpretted well by this formula, The correlation times at dirrerent temperatures and the activqtion energy(Ea=15.0kJ/mol) of methyl group in toluene adsorbed on silica gel were obtained.The correlation times are in the range of 3.56×10-9-5.76×10-8s during 374 K and 240 K. |
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| Keywords: | NMR phpsisorption Longitudinal relaxation Spin dirrusion |
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