Laser analysis of the nonequilibrium ratio of the ortho and para H ₂ O number density in vapor by the ultrasonic vaporization of water

The ratio of the ortho and para H₂O content in vapor produced by the ultrasonic vaporization of liquid water is significantly less than the equilibrium value at normal conditions (3:1) and can reach ~2:1. This phenomenon was observed through spectral analysis of water vapor at 1.35 μm using a tunable diode laser. This deviation could be related to the peculiarities of the formation of gaseous H₂O molecules at ultrasonic vaporization of liquid water where the ortho/para ratio is 1:1.