摘要
自由电子激光 (FEL)可以输出中红外激光 (波长 6～ 16 μm ,波数 16 6 0～ 6 30cm- 1 ) ,由于FEL提供的能量与分子的振动能级相当 ,所以可用于探讨与物质相互作用时的能量转换机理 ;其次FEL的波长在一定范围内能够连续调节 ,可以用来研究化学键的变化 ,即FEL诱导的分子结构变化。基于红外和拉曼光谱是分子结构变化的灵敏探针 ,我们比较了FEL照射前后苯甲酸及邻氨基苯甲酸的FTIR变化 ,发现N—H和CO的伸缩振动峰经FEL照射后发生了位移 ,表明FEL诱导有机分子引发COOH和NH2 之间氢键的重排 ,初步认为这是由于分子中存在稳态和亚稳态结构 ,进一步的解释将涉及到多光子传递以及非线性光学。
Free electron laser (FEL) have been developed as tunable lasers over a wide range of wavelenths,, Equipment in the region of 6-16 mum. (1 660-630 cm(-1)) is available in the Beijing free electron laser erected by Institute of High Energy Physics, CAS. In this study we report first measurements of infrared-induced molecular change under irradiation by FEL of 9.414 mum and 6.228 mum. respectively. Taking o-amino-benzoic acid as an example, FTIR characterization indicates that the peak positions of both N-H and C=O stretching vibrations shift before and after the irradiation of FEL. It demonstrates that FEL induces the re-arrangement of H-bonds between COOH and NH2 by stimulating the vibration of carboxyl groups. It suggests that the presence of stable/metastable phases in the title compound.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2002年第3期384-386,共3页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金 (No 2 9671 0 0 2
39730 1 60
2 0 0 2 30 0 5)
国家基础研究重大课题 (G1 9980 61 30 7)
