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

The library spectra were originally acquired at 2 cm-1 digital resolution and then
mathematically deresolved when converted to Thermo Nicolet library format.
Eight sublibraries of selected deresolved spectra from the complete Aldrich FT-IR
Collection, Edition 2 library are also available from Thermo Nicolet. To see the
titles and contents of the sublibraries, view the Library Listings item as described
in the “Example libraries” section above.
Sigma Biological
Sample Library
All of the spectra in the Sigma Biological Sample Library are also included in the
complete Sigma Biochemicals FT-IR Spectral Library. The complete library
contains over 10,000 FT-IR spectra of interest to those in the biochemical field. The
library spectra were originally acquired at 2 cm-1 spectral resolution and then
mathematically deresolved during conversion to Thermo Nicolet library format.
Five sublibraries of selected deresolved spectra from the complete Sigma
Biochemicals FT-IR Spectral Library are also available. To see the titles and
contents of the sublibraries, view the Library Listings item as described in the
“Example libraries” section above.
Organics by
Raman Sample Library
All of the spectra in the Organics by Raman Sample Library are also included in the
complete Organics by FT-Raman Spectral Library. The complete library contains
Raman spectra of 1,000 organic compounds.
The compounds in this library came from the 0-1000 MINI-STOCKROOM kit,
which was obtained from Chem Service, Inc., of West Chester, Pennsylvania. The
compounds arrived in brown glass bottles. Using a Thermo Nicolet FT-Raman
spectrometer, we were able to collect most of the spectra through the brown glass.
The shipping bottles were not opened. A few of the compounds were provided in
such small quantities that they had to be removed from the shipping bottles and
sampled in NMR tubes.
The spectra have been Raman-shifted to wavenumber values to allow comparisons
with infrared spectra. Your Raman sample spectra must be shifted before you used
them to search this library.
User Example Library
Finding peaks above
a specified height
The 32-bit User Example Library contains 16 spectra from a variety of sources. The
spectra have 4-wavenumber spectral resolution. This library is the only example
library you can edit. Feel free to use this library to try the OMNIC search features.
You can copy this library, edit the compound names, add or delete spectra from the
library, and compress the library.
Use Find Peaks in the Analyze menu to identify peak locations in a spectrum. The
command finds peaks in the displayed spectral region or in the selected region if
you have selected one.
The command searches for peaks whose Y values exceed a specified threshold
value and then labels them with their X values. A list of the peak locations is
added to the log if you are currently logging operations.
By adjusting the threshold and sensitivity of the peak finding operation, you can
find the spectral features you are interested in without labeling noise and other
unimportant features.
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