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用傅立叶变换光谱仪和光学长程装置,记录了CH_2Cl_2分子振动量子数v=1～4的红外吸收光谱(1200～12000 cm~(-1)),归属出CH的伸缩(v_1,v_6)振动和弯曲(v_2)振动和CH_2基团相对于CCl_2基团的摇摆振动(v_8)的泛频和合频能级共47个。考虑了摇摆振动与伸缩和弯曲振动的耦合,使用简正模模型对v_1,v_2,v_6和v_8这四种振动模式的泛频和合频能级进行了拟合,得到了非谐性常数和费米(Fermi)共振和达宁-丹尼生(Darling-Dennison)共振系数。结果表明,摇摆振动与伸缩振动之间的Fermi共振(k_(188)=-254.63 cm~(-1))大于弯曲振动与伸缩振动之间的Fermi共振(k_(122)=-54.87 cm~(-1))；伸缩振动之间的Darling-Dennison共振(k_(1166)=-215.28 cm~(-1))大于弯曲振动与摇摆振动之间的Darling-Dennison共振(k_(2288)=-5.72 cm~(-1))。用拟合得到的光谱参数计算出CH_2Cl_2分子的振动能级,与实验数据很好地符合。
The Fourier transform spectrometer and optical long range device were used to record the infrared absorption spectrum (1200 ~ 12000 cm -1) of vibrational quantum number of CH_2Cl_2 v = 1 ~ 4, (v_2) vibration and CH_2 group relative to the CCl_2 group swing vibration (v_8) of the pan and the frequency band of a total of 47 combinations. Considering the coupling between the rocking vibration and the telescopic and bending vibration, we use the orthonormal model to fit the ubiquitous and the tonal energy levels of the four vibration modes v_1, v_2, v_6 and v_8, and obtain the non-harmonic constants and Fermi Fermi resonance and Darling-Dennison resonance coefficient. The results show that the Fermi resonance (k_ (188) = - 254.63 cm -1) between the rocking vibration and the stretching vibration is larger than the Fermi resonance between bending vibration and stretching vibration (k 122 = 54.87 cm ~ The Darling-Dennison resonance (k - (1166) = - 215.28 cm -1) between the stretching vibration is larger than the Darling-Dennison resonance between the bending vibration and the rocking vibration (k 2288) = - 5.72 cm -1). The vibrational energy levels of CH_2Cl_2 molecules were calculated by the fitted spectral parameters, which were in good agreement with the experimental data.