Should I correct the baseline of my spectrum?
If a baseline is sloped or curved or significantly above zero
absorbance (or below 100% transmittance), a likely cause is how the
sample was prepared. By correcting the baseline, you can often
avoid having to prepare the sample again and collect a new
spectrum.
Correcting a baseline will give you better results when you search
the spectrum against a library, subtract the spectrum from another
spectrum, find peaks in the spectrum or quantify components in the
spectrum.
View “Common Problems with IR Spectra” in the Collecting a
Spectrum tutorial (available through Learning OMNICin the
OMNIC Help menu)...
In OMNIC Help Topics find “baseline” in the Index and go to
“Correcting a baseline manually.”
Converting
spectra to
other units
Which Y-axis unit should I use for a spectrum?
The most commonly used units are % transmittance and absorbance,
but other units are available. The table that follows lists the units
available and common uses for each.
Nicolet 380 User’s Guide
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