Influence of sample pressure on the sensitivity of the laser optoacoustic spectrometer

Acoustic signal as an internal standard for quantitation in laser-generated plumes

“…When the pressure is below 1 Torr, the coupling efficiency is low and the acoustic signal is relatively weak and decays rapidly. The signal amplitude increased with pressure, due to the increase in coupling efficiency (40). At a pressure of around 10 Torr, it was found that the coupling efficiency increased sharply with laser power, resulting in eui undesirable nonlinear response with respect to laser power.…”