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- W2055246811 abstract "Abstract CO is adsorbed at 298 K only on the (0001) faces of polycrystaltine αCr 2 0 3 with the appearance of a single i.r. peak whose frequency shifts from 2185 (θ ≈ 0) to 2170 cm -1 (θ max ). This shift is due to the building up of adsorbate-adsorbate interactions (dynamic and static). The dipole--dipole (dynamic) interaction has been measured by means of the diluted isotopic method and can be explained in terms of CO oscillators adsorbed on identical sites and with their axes parallel. This suggests that the (0001) face is fiat and that the Cr 3+ -CO bond, although mainly σ in character, has some participation of the d-π * orbitals, The adsorption of CO causes distinct perturbations in the i.r, spectrum of the α-Cr 2 O 3 (intensity erosions in the multiphonon and fundamental regions): this is ascribed to changes in the anharmonieity and force constants ofsurface vibrations. Attempts to detect the Me-CO stretching and bending vibrations in the low frequency range of the spectrum (700--200 cm -1 ) have been unsuccessful; the reasons for this negative result are discussed." @default.
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- W2055246811 date "1987-01-01" @default.
- W2055246811 modified "2023-09-27" @default.
- W2055246811 title "Adsorbate-adsorbent and adsorbate-adsorbate interactions in CO overlayers adsorbed on α-Cr203 as investigated by infrared spectroscopy" @default.
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- W2055246811 doi "https://doi.org/10.1016/s0584-8539(87)80028-4" @default.
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