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Common Window Materials
Both liquid and solid samples are often mounted on salt windows. Very thin windows,
1 to 2 mm thick, give the best spectra. The following materials are commonly used in
windows:
KBr: Potassium bromide is inexpensive, and it transmits infrared radiation to below
•
−1
400 cm
. The major disadvantage of this material is that it is hygroscopic, so that the
windows fog easily.
•
BaF
: Barium fluoride is not hygroscopic. Its transmittance cut-off is 750 cm
2
break or crack easily.
•
NaCl: Sodium chloride transmits infrared down to 600 cm
are similar to KBr.
•
ZnSe: Zinc selenide is not hygroscopic. Its transmittance cut-off is 650 cm
more durable than the other windows but is yellow, so that the field of the Monitor
visible window appears yellow.
Preparing Samples . 57
−1
. It can
−1
. Otherwise, its properties
−1
. ZnSe is
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