Experimental Considerations Relating to the Different Vibrational Spectroscopic Techniques Available

Experimental Considerations Relating to the Different Vibrational Spectroscopic Techniques Available [Pg.3]

Infrared spectroscopy is capable of giving spectra of very good signal/noise from adsorbed species on finely divided metal catalysts. Samples are usually [Pg.3]

Vibrational Electron-Energy-Loss Spectroscopy (VEELS) (21) [Pg.5]

This form of electron spectroscopy has high sensitivity for monolayer studies but much lower spectral resolution than infrared spectroscopy, normally 20—40 cm Recent developments (22) hold out the possibility of experimen- [Pg.5]

The present-day literature contains many more spectra obtained from singlecrystal metal surfaces by VEELS than by RAIRS. However, the much higher resolution available from the more recently developed RAIRS technique and its capability of operating in the presence of a gas phase suggest that it will contribute increasingly important information in the hydrocarbon adsorption field. The three spectroscopic techniques discussed above are much the most important ones in this area, with transmission infrared spectroscopy as the predominantly useful one for work with finely divided samples. A few other vibrational spectroscopic techniques (25) have provided information on adsorbed hydrocarbons, but are at present of more limited or specialized applications. Their principal characteristics are more briefly summarized below. [Pg.5]