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Chern. 86, 310 Somorjai: Surf. Sci. 121, 303-320 (to be published) 2. Fourier-Transfonn Infrared Spectroscopy in Heterogeneous Catalysis A. Bell With 13 Figures 2. 1-9]. Because infrared spectra can be acquired in the presence of a gas phase, and over a broad range of pressures and temperatures, it is often possible to obtain information about the working state of the catalyst. Such in situ studies have helped to establish whether an adsorbate undergoes rearrangement or decomposition upon adsorption, and in a limited number of instances has led to the identification of reaction intermediates.
L. 3, ed. R. H. J. 11 R. R. 13 T. R. J. W. Hannah: Appl. Spectrosc. R. P. 9, ed. E. H. F. S. J. C. T .. Bell: J. Catal. P. Eischens: Ace. Chern. Res. A. H. Amberg: J. Chern. Phys. 31 38 P. T. Bell: J. Catal. M. D. D. A. Parodi: Appl. Spectrosc. -H. ): Optoacoustic Spectroscopy and Detection (Academic, New York 1977) A. E. W. Wakefield: Anal. Chern. W. Vidrine: Appl. Spectrosc. 34, 405 (1980) A. Rosencwaig, A. Gersho: J. Appl. Phys. J. T. Bell: In Catalysis Under Transient Conditions, ed. T. L. Hegedus, ACS Symposium Ser.
1) cannot be executed over s from ~to ~. 2S_2+ smx). As a consequence, the integration can be performed only over a finite range. 2b shows that truncation of the limits of integration results in a broadening of the spectral peaks. An additional consequence of finite retardation is the appearance of secondary extrema or "wings" on either side of the primary features. The presence of these features is disadvantageous, especially for observing a weak absorbance in proximity to a strong one. To diminish this problem the interferogram is usually multiplied by a triangular apodization function which forces the product to approach zero continuously for s = ±s max .