Analyzing Samples
Agilent 5500 Series FTIR Operation Manual
29
In the sample analysis mode, the TumblIR is rotated such that the
accessory optical window is facing down towards the 5500t FTIR
sample mounting area. In this position, infrared (IR) energy passes
through the sample making measurement possible. Be sure to rotate
the TumblIR arm completely around until it reaches the detent and
snaps into position. This detent keeps the accessory stationary
during sample measurement (see Figure 5).
When in the sample analysis mode, the TumblIR pathlength is
100 microns, an optimal pathlength for mid-IR analysis of many
liquid, paste or gel samples. The alignment of the accessory is pre-set
at the factory and so there is no adjustment required.
The steps involved with analyzing a sample on the 5500t FTIR system
with a TumblIR are:
1
Clean the sample windows.
2
Collect a background spectrum.
3
Collect a sample spectrum.
Cleaning the accessory
To clean the TumblIR accessory:
1
Rotate the TumblIR arm so the optical sensor is pointing upward.
2
Clean the top window first, then clean the bottom window,
indicated in Figure 4.
NOTE
Only use soft cotton cloth, such as found on cotton swabs or a suitable
substitute to clean the optical sensor and sampling area.
CAUTION
The windows are made of an IR-transmitting material called zinc selenide (ZnSe).
ZnSe is a relatively durable material, but can be easily scratched or damaged if
too much pressure is applied during cleaning or if an abrasive material is used,
such as Kimwipes. Materials such as cotton swabs dipped in acetone are
recommended for cleaning.
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