Variable temperature photoacoustic spectroscopy. I. Instrumentation

To use the advantages of photoacoustic spectroscopy for low temperature measurements, e.g. in the study of frozen liquids or suspensions, a new high performance photoacoustic cell has been constructed which allows continuous variation of the temperature between 90 K and 320 K. The frequency response of the cell at 90 K and 295 K is examined by means of a carbon black sample.