LIF spectroscopy of OH radicals and the electron temperature in the effluent of atmospheric RF JET in Ar-H2O mixtures

Active laser spectroscopy (TALIF and LIF) is used to study the spatial distribution of atomic oxygen and OH radicals in an atmospheric Ar-O2 plasma jet. Two damensional O and OH species distributions in the jet are measured. The TALIF results are compared to the two-photon absorption laser-induced stimulated emission. Plasma with 0.3% O2 is characterized by highest TALIF signal. Time-resolved LIF spectrum of the OH (0-0) band indicates that the rotational population of OH states significantly depends on the rotational and vibrational relaxation.