Choice of Window Materials for Transmission Sampling of Liquids in the Mid-IR Spectral Region
Measurement of liquid samples or samples dissolved in aqueous or organic solvents in the infrared (IR) spectral region is often done using a liquid cell of either fixed or variable pathlength. The liquid cell may be of sealed construction where windows are amalgamated together with a spacer to define the sampling pathlength, or it may be of a demountable design where the user can freely change sampling pathlength or window material. In the case of a neat, liquid sample that is somewhat viscous and the sampling pathlength does not need to be reproduced, we can simply press the liquid sample between 2 infrared transparent windows and collect the IR spectrum.
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