Water vapor absorption of 266 nm laser nanosecond pulses with linear and circular radiation polarization
G.Yu. Golubiatnikov1, A.N. Kuryak2, B.A. Tikhomirov2
1Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: поглощение УФ-излучения, водяной пар, диссоциация, анизотропия акустического импульса, absorption of UV radiation, water vapor, dissociation, acoustic pulse anisotropy
Abstract
An increase of 50% in the amplitude of the photoacoustic signal generated when water vapor absorbs pulses of laser radiation at 266 nm with circular polarization, relative to the signal for radiation with linear polarization, is reported. The effect observed is associated with different dissociation efficiency of H2O molecules as a result of one- and two-photon absorption of radiation with linear and circular polarization.
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