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2-5a, and the double pass geometry, Fig. 2-5b, respectively. The double pass geometry has the advantage that the internal reflection element can be of any length but it is more difficult to align optically. The surface of the element must be smooth at least on the scale of the wavelength of radiation used and, of course, must be transparent. 6 Experimental Techniques 41 of any composition by supporting the film on an internal reflection element which has good infrared properties. One distinct advantage of internal reflection over external reflection is the existence of electric fields in all three spatial directions [45].

2-10 Spectrum of chemisorbed propylenes on ZnO in the C-H stretching region: (a) CH 3 —CH=CH 2 , (b) CH 3 - C D = C H 2 , (c) CD 3 —CH=CH 2 , (d) CD 3 —CH=CD 2 . From Dent and Kokes [16]. was found to be 30:100:10. This is quite different from the gas phase where the ratio is 100:26:4. While in principle both the syn and anti π-allyl could be formed from 1-butene, only anti π-allyl is observed. The syn isomer could be observed initially when its precuror, irarcs-butene, was used as reactant but only the anti π-allyl is evident as equilibrium.

Basila has reported a case where it appears that charge transfer is the dominant phenomenon as evidenced by a nearly linear shift in the OH frequency on silica with the change in the ionization potential of alkyl benzenes [23]. On the other hand, a simple electrostatic model predicts reasonably well the shift in frequency of the OH stretching band of Y-zeolites upon physical adsorption of 0 2 , Ar, CH 4 , N 2 , and Kr; the model allows the calculation of the ratio of the electric fields at the OH dipole in the presence and in the absence of the adsorbed molecules [24].

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