Abstract
The stretching vibrations of the –CH 3 and –CH 2– groups not only overlap but also interfere with each other in the Sum-Frequency Generation (SFG) vibrational spectra of the air/ethanol interface. Using deuterated ethanol samples, i.e., CH 3CD 2OH and CD 3CH 2OH, the C–H stretching vibrational modes are clearly assigned for the SFG vibrational spectra of their air/liquid interfaces according to the polarization selection rules. It is found that the CH 3-ss and CH 2-ss modes overlap in the ∼2875 cm −1 peak, the CH 3-as and CH 2-ss-Fermi modes overlap in the ∼2970 cm −1 peak, and the ∼2930 cm −1 peak belongs to the CH 3-ss-Fermi mode, respectively.
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