Analyzing Samples
Agilent Cary 630 FTIR Spectrometer User’s Guide 53
6 After completing the sample measurement, immediately clean the
sample from the DialPath using the instructions provided
previously. It is important to make sure both the top and bottom
windows are free of any residue from the previous sample.
For instructions on reviewing results and handling sample data, refer
to the Agilent MicroLab PC Software User’s Guide.
Diffuse Reflectance Sampling Accessory
The Diffuse Reflectance sampling accessory provides quantitative and
qualitative analysis of powdered or solid samples. This technique
provides more sensitivity in a quantitative analysis than ATR, while
still being easy to use.
Powdered samples are commonly mixed in KBr powder at a level of
approximately 3 to 5%. However, the loading of the sample in KBr can
be adjusted to obtain the required sensitivity. The Diffuse Reflectance
accessory is optimized for use with the Cary 630 FTIR optical system,
providing the greatest sensitivity available for quick, accurate
measurements.
The Diffuse Reflectance accessory uses a four-position sample holder
(see Figure 17), which slides into a slot on the right side of the
accessory. The first position of the holder contains a diffuse
reflectance gold mirror, which is used for background collection. The
other three positions are used for filling with KBr/sample mixtures.
Detents in the holder allow you to gauge which position is being
measured.
Figure 17. Diffuse Reflectance sample holder
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