Publication
The importance of molecular relaxation in photoacoustic spectroscopy is discussed. The particular case of methane monitoring in dry oxygen using a 1.65-μm laser-based photoacoustic sensor is reported. The slow vibration-to-translation energy transfer occurring in this gas mixture results in a drastic reduction of the detection sensitivity. A quadratic response of the sensor to the methane concentration is also reported and explained by molecular relaxation effects
Satoshi Takahama, Giulia Ruggeri, Sarah Elizabeth Shipley
Hatice Altug, Felix Ulrich Richter, Andreas Tittl, Aurélian Michel John-Herpin
Ivo Furno, Alan Howling, Alexandra Waskow, Lorenzo Ibba