Thermo Scientific Nicolet iS50 User Manual page 13

Thermo Scientific
Table 5. iS50 ATR Touch Point Settings
Option
Measurement time
Number of scans
Resolution
Final format
Preview data
collection
Region
Max/Min
Description
Determines the duration of scanning for a sample data
collection.
Shows the scans collected for the selected measurement time.
Multiple scans are averaged.
Sets the spectral resolution of the data you collect. Typically
-1
4 cm or occasionally 2 cm
applications. The smaller the resolution value, the higher
(better) is the resolution. The resolution value, along with the
measurement time, affects the number of scans.
Determines the Y-axis unit used for the collected data.
Typically set to log(1/R) or %Reflectance for ATR
applications.
Select this option if you want to collect and view (but not save)
preliminary data before the start of a sample or background
data collection. This lets you verify that your experimental
conditions are correct before collecting the spectrum.
Determines the spectral range of the spectrometer that will be
used to collect the ATR data. The spectral range is defined by
the type of source, beamsplitter and detector used. One of
more of the following options may be available:
• Mid-IR - useful for measuring organic materials,
polymers, plastics, rubbers and many other materials.
• Far-IR - ideal for inorganic materials that are blended in
plastics or paints including fillers, flame retardants and
structural composites such as glass fibers. To maximize the
signal for the far-IR beam path, use Collect > Experiment
Setup > Bench to set Gain to 8.
• NIR - The NIR region is generally not useful for ATR
sampling because, in most cases, the depth of penetration
is too shallow to produce a usable spectrum.
Note: Collecting data in multiple regions (must be done
sequentially) can be useful for finding differences between
compounded materials that contain fillers and other inorganic
compounds.
Shows the default limits of the selected detector's spectral
range. The Max/Min limits can be reduced to eliminate
spectral regions that provide no additional information about
the sample.
1
iS50 ATR Module
-1
are appropriate for most ATR
iS50 ATR Module User Guide 11