Molecular Spectroscopy of Oxide Catalyst Surfaces by Davydov

By Davydov

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Schematics of cell-reactors used for studying the spectra of adsorbed molecules at (a) room, and (b) high temperatures: 1, cell body; 2, sample holder; 3, evacuation port; 4, case for thermocouple; 5, container for heater; 6, 10, cooling channels; 7, 11, flanged connectors; 8, windows; 9, connectors; 12, sample pocket. 8. Schematics of vacuum cells with silicon windows: (a) for low-temperature investigations; (b) with a short optical path. other [64, 65]. Connections between the cell body and the windows is achieved by using iridium or gold foils, or with Teflon [42].

However, one of the essential limitations in the study of such systems is the absorption of IR irradiation by the bulk adsorbent which, of course, makes it difficult to obtain spectra of the surface impurities in the fundamental absorption spectral region of the bulk solid. For this reason, until FTIR spectroscopy became available, analysis was limited to the region above the so-called ‘cutoff’ frequency. To increase sensitivity, the sample transmissions are made wider by about one order of magnitude than would be used in the analysis of the spectra of the bulk adsorbents using potassium bromide or cesium iodide disks.

5. Fundamental modes of vibration of (a) linear, and (b) nonlinear molecules. VIBRATIONAL SPECTROSCOPY 11 comparison with the spectra of bulk compounds or fragments isolated in a matrix. However, in this way only certain types of compound can be identified. Calculations of the vibrational spectra of individual surface species based on the modeling of the potential function of the molecule (vibrations in the force constants of the potential function) are useful for interpreting changes in vibrational frequencies and their reactions to changes in the force field of molecules subjected to the influence of a highly nonuniform field at an adsorbent surface [19, 118].

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