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Infrared Spectroscopy of CO Isolated in Solid Nitrogen Matrix
Lei Wu,Ricardo Lambo*,Yan Tan,An-wen Liu,Shui-ming Hu
Author NameAffiliationE-mail
Lei Wu Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 30026, China  
Ricardo Lambo* Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 30026, China lambo@mail.ustc.edu.cn 
Yan Tan Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 30026, China  
An-wen Liu Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 30026, China  
Shui-ming Hu Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 30026, China  
Abstract:
The infrared absorption spectra of the CO monomer isolated in solid N2 have been recorded at various temperatures between 4.5 and 30 K. The absorption features of the fundamen-tal stretching mode show its linewidth and matrix-induced frequency shift to be weakly temperature-dependent. As the temperature of the matrix was raised, an increase in the linewidth together with a redshift in the central frequency was observed. These observa-tions were explained in terms of the quenching of the CO rotational states by the N2 matrix into closely-lying librational states. A quantitative model was then used to calculate the energy difference between these librational states. Results show that they can be thermally populated through the absorption of matrix phonons.
Key words:  Phonon coupling, Vibrational relaxation, Energy gap law
FundProject:
固态氮气基质中CO的红外光谱
吴磊,Ricardo Lambo*,谈艳,刘安雯,胡水明
摘要:
CO单体在固体N2基质中在4.5~30 K范围内的红外吸收光谱.基本的拉伸模式的吸收特征显示其基质诱导峰宽和位移呈现弱的温度依赖性. 随着基质的温度升高,峰宽增加并且主要峰发生红移,这可能与在N2基质中CO旋转状态转变成近似于振动状态有关. 并用定量模型计算振动态之间的能量差异.
关键词:  声子耦合,振动弛豫,能隙定律
DOI:10.1063/1674-0068/27/01/5-8
分类号: