Photoacoustic spectroscopy on gases with high pressure continuously tunable CO₂ laser

Abstract

We present a novel photoacoustic detection system with a high pressure CO2 laser as radiation source. The laser is continuously tunable across wavelength ranges from 13 cm-1 to 18 cm-1 wide. The narrow bandwidth of 0.017 cm-1 allows to resolve any fine structure in the absorption spectra of trace gases at atmospheric pressure. The absorption spectra of four gases are reported, demonstrating the great potential improvement in detection selectivity

Laser photoacoustics for gas analysis and materials testing

“…Based on continuous spectra with good resolution, however, the two cornpounds can easily be separated. 22 In the meantime, spectra of various compounds of environmental interest have been taken. In general, good agreement with spectra calculated from the HITRAN database,23 where available, has been found.…”