- 作者: 張煥正 ; 戴俊惠 ; Ewing, George E.
- 作者服務機構: 中央研究院原子與分子科學研究所
- 中文摘要: The fundamental (.DELTA.v=1 .arrl.0) and the first overtone (.DELTA.v=2.arrl.0) transitions of monolayer physisorbed CO on NaCl(100) single crystal surfaces at 5K have been investigated using polarized Fourier transform infrared spectroscopy. Comparisons of the transition frequencies, bandwidths and absorbances for these two transitions together with those of dilute isotopes allow us to isolate the contribution of dynamic and static coupling effects of molecules within the monolayer. Homogeneous and heterogeneous effects can also be distinguished from band profiles of these various transitions. We conclude that the residual line broadening of 0.1/cm at 5K for the isolated CO isotopes arises from heterogeneous surface effects. We set an upper limit of 0.07/cm for the linewidth of single CO molecules on NaCl(100) due to surface heterogeneity. A lower limit of 1*10/sup -8//cm is provided by the vibrational lifetime of adsorbed CO molecules. Sharpness of the vibrational features shows that infrared spectroscopy of adsorbate is a sensitive method for probing surface and adlayer irregularities of adsorbed molecules on a single crystal.
- 英文摘要: --
- 中文關鍵字: Vibrational Spectroscopy; Sodium Chloride; Carbon Monooxide; Coupling Effect; Surface Heterogeneity
- 英文關鍵字: 振動光譜術;氯化鈉;一氧化碳;耦合效應;表面異相