Abstract
A novel technique of preparing thin (<10 μm) homogenous samples for infrared (IR) and far-infrared (FIR) spectroscopic studies is presented. In contrast to conventional methods (e.g. casting a film from solution, pressing a pellet of a mixture of KBr with the sample), the material to be studied is dissolved in a suitable solvent and made into an aerosol by use of an ultrasonic vaporizer. The sample material is then freeze dried on a substrate mounted on a temperature-controlled (100 K to 300 K) cold finger of a cryostat placed in a glass chamber. By this method, especially highly crystalline materials obtained in powder form can easily be prepared as thin solid films with a diameter of about 20 mm.
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