Surface Selection Rule and Molecular Orientation

As in IRAS, the surface selection mle is represented by the mathematical formula as 

The molecular orientation of benzenethiol adsorbed on a quasi-Au(lll) surface was analyzed from a comparison of a SEIRA spectrum with a KBr spec- 

It is weU known that the adsorption coefficients of adsorbed molecule are a function of coverage (for example, CO on Ru(OOl) in UHV [63]). This has been explained by dipole-dipole coupling or by coupling through metal electrons [27]. On the other hand, in an electrochemical environment, a linear relationship between band intensity and coverage has been reported for linearly bonded CO on 

Pt electrodes [64, 65]. Since the dipole-dipole coupling between adsorbates with weaker absorption than CO is small, this effect may be neglected in the most cases. 

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