Accessory for high‐sensitivity spectrometry of strongly absorbing and air‐sensitive liquid samples under vacuum

A simple accessory of a previously reported optical absorption cell allows some operations on the sample, and spectrometric measurements with the cell and sample under vacuum to be performed. It enables one to handle extremely air‐sensitive specimens, and to get easily and reproducibly liquid films of thickness down to 6 μm. Consequently it is possible to record the entire IR spectrum of a solute in a single solvent and to use very strongly absorbing solvents, water included.