Phosphorescence of Oxygen Excited at a Wavelength of 765 nm

The phosphorescence of oxygen in the liquid phase and in tetrachloromethane solution is studied under direct optical excitation by a light-emitting diode array at a wavelength of 765 nm. The intensity of observed oxygen phosphorescence at a wavelength of 1270 nm excited at a wavelength of 765 nm is compared with the phosphorescence intensity in the case of excitation at other wavelengths partially or completely coinciding with the absorption lines of molecular oxygen complexes.