Photoacoustic Raman spectroscopy (PARS) using cw laser sources

摘要: We have devised a new nonlinear spectroscopic technique, photoacoustic Raman spectroscopy (PARS), which uses acoustic methods to detect energy deposited in molecular gas by the process of stimulated scattering. The technique was demonstrated excitation 2916.7‐cm−1 ν1 symmetric stretch vibrational mode CH4 using two cw laser sources (an argon ion at 514.5 nm and tunable dye near 605.4 nm). Excellent agreement between calculated experimentally observed PARS signals obtained for CH4.