ИСТИНА

Based on quenching theory, the chemical composition of gas-phase species released to the lunar exosphere during meteoroid impacts has been estimated. The column densities of atoms of main elements in the exosphere during quiet periods and activity of Perseid meteor shower are estimated. In searching for impactproduced metal atoms in the lunar exosphere, it is better to make spectral observations at altitudes of about 1000 km. Very high-resolution spectral observations would also be highly desirable for detection of non-Maxwellian velocity distribution of Na atoms produced by NaOH and NaO photolysis.