Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

Split At 2000 cm-1 – In this format (see the following example) spectra are
displayed in wavenumbers, and the X-axis is split into two regions with a change
of scale at 2000 wavenumbers. (A vertical dashed line appears at the split.) The
scale of the region below 2000 wavenumbers is expanded by a factor of 2 as
compared with the scale of the region above 2000 wavenumbers.
This format is useful for spectral interpretation. The region below 1,500
wavenumbers is the “fingerprint” region. Here you can find characteristic peaks
that confirm your identification of the compound. Expanding this region with the
Split At 2000 cm-1 format makes it easier to view these peaks. This region is also
where you can observe the spectral effects of molecular bending.
The region above 1,500 wavenumbers is called the “functional group region” and
is where you can observe the effects of molecular vibrational stretching.
This format was commonly used in the past to display and plot data collected
using dispersive spectrometers.
Split At 2200 And 1000 cm-1 – In this format (see the following example) spectra
are displayed in wavenumbers, and the X-axis is split into three regions, each with
a different scale. (A vertical dashed line appears at each split.) As you move from
left to right, the scale of each region is expanded by a factor of 2 as compared with
the scale of the region to its left.
OMNIC User’s Guide 169