Laser photoacoustic control of water quality

Photoacoustic response in liquids after pulsed laser excitation usually has a complicated shape which cannot be explained in simple macroscopic descri ption. It was found experimentally that spatial organization of absorbing a nalyte can affect on Fourier spectrum of photoacoustic response. It was sup posed that the presence of non-absorbing ions in aqueous solution can also affect on photoacoustic response due to water molecules association. It was found in experiments that there is strong correlation between Raman scatte ring intensity of red part of OH vibrational line (connected with associate d molecules) and high-frequency part of photoacoustic Fourier spectrum.