RAIRS hydrocarbon surface species

A di-cr species formed across the original double bond in propene would have no symmetry elements so that, in principle, all 27 modes internal to the hydrocarbon groupings could be active in the VEEL or RAIR spectra. In view of the limited resolution of the available VEEL spectra, it would be unrealistic to attempt a comprehensive vibrational analysis at this stage. However, the spectra observed are clearly from a substituted alkane surface species, and they exhibit all the strong features expected from a di-[Pg.75]

During the past decade a very considerable literature has developed concerning the generation and reactivity of alkyl and alkylidene groups adsorbed on metal single-crystal surfaces produced via the photochemical or thermal decomposition of adsorbed alkyl halides or nitrogen-substituted alkanes. In this review, we concentrate on publications which exhibit VEEL or RAIR spectra of the hydrocarbon groupings that can be used as reference spectra for the identification of such species in spectra of species derived from hydrocarbon chemisorption. Reviews of such work cover the kinetic as well as spectroscopic aspects of this area of research (142-144). 

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