Optoacoustic detection of low concentrations of hydrogen fluoride, nitric oxide, and carbon dioxide in gases using radiation of pulsed hydrogen fluoride laser

Microscopic amounts of HF, NO, and CO₂ molecules were detected in air and in nitrogen by the optoacoustic method using radiation of a pulsed HF laser. The minimum detectable concentration was one part impurity in 10⁶ parts of air. The absolute calibration of the recording system was performed using the absorption of pulsed CO₂ radiation in a standard mixture of CO₂ and N₂.