Analyzing Samples
42 Agilent Cary 630 FTIR Spectrometer User’s Guide
Collecting a sample spectrum
To collect a sample spectrum using the Transmission accessory:
1 Place your sample in the sample holder.
CAUTION
Ensure that the sample is correctly placed in the holder and that it is properly
aligned for the infrared beam to pass through the sample. Use the positioning pin
at the bottom of the holder to establish the correct distance from the bottom of
the sample compartment.
2 Collect a sample spectrum. For instructions on collecting a sample
spectrum using the software, refer to the Agilent MicroLab PC
Software User’s Guide.
For instructions on reviewing results and handling sample data, refer
to the Agilent MicroLab PC Software User’s Guide.
10 and 45 Degree Specular Reflectance Sampling Accessories
The Agilent 10 and 45 degree specular reflectance accessories (SRA)
for the Cary 630 FTIR allow for near-normal (<10 degrees) or at-angle
(>10 degrees) specular reflectance measurements. Specular
reflectance measurements are made on samples that, in general, are
designed to reflect light from a flat surface. Examples include mirrors,
glass, windows and thin film coatings placed upon highly reflective
substrates. The intended end use of the product typically dictates
whether a sample is measured at near-normal and/or at-angle. Use the
10 degree SRA for near-normal specular reflectance measurements
and the 45 degree SRA to measure specular reflectance at-angle and
for the measurement of relatively thin films on reflective substrates.
Figure 10. 10 degree (left) and 45 degree (right) SRAs
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