Chemistry Reference
In-Depth Information
Gauge pressure
location
Wafer holder hook
(top position)
Glass squared
pipe
Wafer holder
To vacuum
apparatus
Sample
Heater
element
KBr
windows
IR
Figure 4.5 Schematic representation and photograph of the in situ IR cell. Figure kindly
provided by Dr. P. Bazin, LCS, Caen, France
The principle of probe molecule use to investigate a solid surface is conceptually
simple; a molecule (whose vibrational modes are well known) in the gas or vapour
phase is sent onto the surface to be analysed. The modification of the probe vibrations
due to the interaction(s) will reflect the state of the surface itself, i.e. the physico-chemical
properties of the solid, the concentration of the adsorption sites, their strength, the mode of
coordination, etc. The use and the choice of appropriate probe molecules have been
detailed in numerous papers and in particular in reference 28, which should be consulted
for further information.
