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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。
FEL can output mid-infrared laser (wavelength 6 ~ 16 μm, wave number 16 6 0 ~ 6 30cm-1). Since FEL provides energy equivalent to molecular vibrational level, it can be used to explore the interaction with matter When the wavelength of the FEL can be continuously adjusted within a certain range, can be used to study changes in chemical bonds, FEL-induced molecular structure changes. Based on the infrared and Raman spectra of sensitive probes for molecular structure changes, we compared the FTIR changes of benzoic acid and anthranilic acid before and after FEL irradiation. We found that the stretching vibration peaks of N-H and CO shifted after FEL irradiation, This suggests that FEL induces organic molecules to initiate the rearrangement of hydrogen bonds between COOH and NH2. This is presumed to be due to the existence of steady-state and metastable structures in the molecule. Further explanations will involve multiphoton propagation and nonlinear optics.