【摘要】 本工作采用激光光声谱对85K多晶Cu表面上NH₃分子的物理吸附进行了研究。通过监测NH₃分子伞形振动模（ν₂）,发现在清洁和预吸附O的Cu表面上,相同物理吸附态NH₃分子振动谱的峰位频率和峰的半高宽度（FWHM）随覆盖度表现出不同的变化规律,对应着不同的物理吸附机理。实验结果同时表明高分辨率的光声谱在研究弱吸附体系细致结构和细微作用方面的潜力。更多还原

【Abstract】 Ammonia physisorption on polycrystalline copper surface at 85 K has been studied by infrared photoacoustic spectroscopy. Much attention has been paid on the vibrational spectra of ammonia symmetric deformation mode and its band variation as a function of coverage. The different coverage dependent behaviors are exhibited for ammonia adsorption respectively on clean and on oxygen pre-adsorbed copper surface, and can be explained by assuming that ammonia follows different adsorption mechanisms. Studies of the minute discrepancy between them further illustrate the applicability of this technique in surface adsorption analysis.更多还原