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152 Chapter 7
as water and hydroxyl groups. Prior to each exposure, a spectrum of the clean sample was
recorded to be as a background reference. The exposure of the sample to CO and CO2 was
carried out by backfilling the measurement chamber through a leak valve. All UHV-FTIR
spectra were collected with 512 scans at a resolution of 4 cm -1 in transmission mode. The
figures below show the UHV-FTIR apparatus (Figure 7.1) and the schematic
representation of the whole optical path of the IR beam in both reflection and
transmission geometries (Figure 7.2).
Figure 7.1. The UHV‐FTIRS apparatus in (a) perspective view and (b) top view. The labeled
components are: (1) load‐lock, (2) distribution, (3) magazine, (4) measurement (FTIR) chambers,
(5) sample manipulator, (6) vacuum FTIR spectrometer, (7) preparation chamber (planned).
Reprinted with permission from Y. Wang, A. Glenz, M. Muhler, C. Wöll, Rev. Sci. Instrum. 2009, 80,
113108‐6, with the permission of AIP Publishing. [300]