Lidar measurements of hydrogen fluoride concentration in atmospheric boundary layer

The possibility of measuring the concentration of hydrogen fluoride molecules in the range from 10¹⁴ to 10¹⁶ cm^-3 in the atmospheric boundary layer at probing distances up to 1.5 km is estimated, taking into account the spectral width of the instrumental function of the Raman scattering lidar. Computer simulation of the lidar equation for our experiment and the measurement time _td=100 s made it possible to obtain computational solution of this equation for three values of the laser radiation wavelength, i.e. 405, 532, and 650 nm. It was concluded that the minimum concentration of hydrogen fluoride molecules 1.8810¹³cm^-3 can be recorded at a wavelength of 405 nm and a distance of up to 100 m at a laser pulse repetition rate of 1 MHz and at a distance of up to 1500 m - 7.64 10¹⁵ cm^-3. The concentration level of HF molecules equal to 1.5. 10¹⁴ cm^-3 at a laser radiation wavelength of 405 nm can be measured at a distance of up to 650 m, at a wavelength of 532 nm - up to 350 m and 650 nm - only up to 200 m during measurement time of 100 s.