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A peak at 1400 cm
-1
indicates that there is some water on the probe. This could indicate poor
purge quality.
Figure 5: Peak indicating the water in the spectrum
A negative peak indicates that although the probe is clean now, it was not clean when the
background was taken. Another background must be taken before any spectra can be
measured.
Figure 6: Negative peaks indicating the background was taken when the probe was unclean or not fully
purged.
1.4. Taking a background
FTIR requires the collection of a background spectrum (also called a reference or baseline
scan) before any absorption scans can be performed. This must be performed before the
probe is inserted into the reaction/process of interest. The process for collecting a reference
scan can be found in
DOC0893 KeitSpec Software User Manual,
Section 1,
Getting Started
.
