| abstract |
In accordance with the method according to the invention, a laser light (220) is introduced into a light path crossing at least one measuring station realized by a photoacoustic chamber (280) containing the gaseous sample, by subjecting the incident laser light (220), as fundamental harmonic, to frequency multiplication at least one higher order harmonics thereof is produced, by directing the fundamental harmonic through a measuring station the impurity components of the gaseous sample are excited, by directing the at least one higher order harmonies obtained by frequency multiplication through a measuring station one by one the impurity components of the gaseous sample are excited, the photoacoustic signals obtained at the wavelengths, as exciting wavelengths, of the fundamental and the higher order harmonics are detected, and by evaluating the photoacoustic signals obtained the impurity components of the gaseous sample are identified one by one. |