【摘要】 本文利用支线调谐的连续CO₂激光器,在9.2～10.8μm的波段范围内,采用光声光谱的方法作了金属银表面吸附有机分子的红外激光光声光谱工作,测量了覆盖在银表面上的四层花生酸分子（Arachidicacid）以及面密度分别为σ₁=1.4×10¹⁵cm^-2和σ₂=5.5×10¹⁵cm^-2的 2-醋酸纤维素分子（cellulose dia-cetate）的红外激光光声谱.观察到了覆盖在银表面上的四层花生酸分子在944cm^-1附近的光声谱峰值,与其固体样品的红外傅里叶谱比较,没有发现可观察到的移动;我们也观察到了σ₁=1.4×10¹⁵cm^-2和σ₂=5.5×10¹⁵cm^-2的2-醋酸纤维素样品分别在1054cm^-1和1059cm^-1处的峰值,与同样样品的固体红外透射谱比较,发现前者的峰值有约5cm^-1的红移,而后者在实验精度范围内没有明显的峰值的位移.更多还原

【Abstract】 Using a branch-tuning CW CO2 laser in the range of 9.2μm to 10.8μm we have studied the IR laser photoacoustic spectra of organic molecules adsorbed on the surface of silver. The adsorbed molecular spectra of four layers of arachidic acid and cellulose diaoetate with different surface densities have been studied. No peak shift was ound in the comparision between the IR photoacoustic spectra of four layers of arachidic acid near 944cm-1 and the corresponding IR Fourier spectra of solid ar-achidic acid. For the IR photoacoustio spectra of cellulose diacetate with σ1=1.4×1015 cm-2 and σ2=5.5 × 1015cm-2 respectively, we compared them with corresponding IR transparent spectra, of solid cellulose diacetate. It has been found that the peak of the former near 1054cm-1 has a red shift about 5 cm-1 and the peak of the later has no obvious shift within the accurancy of the experiment.更多还原