  Influence of the meteoroid bombardment on properties of the lunar exosphere
has been confirmed. Quick increase in the zenith column density of Na atoms
above the lunar north pole on August 13, 2009 at 0-1 UT is detected and
explained by numerous collisions of relatively small Perseid meteoroids (< 1
kg) with the Moon during maximum of the Perseid meteor shower. New stringent
upper limits of the column densities for Ca, Ba, and Ti atoms in the lunar
exosphere are obtained as 5*10^7, 2.2*10^6, and 6.9*10^8 cm^-2, respectively.
It is found that the content of impact-produced Ca and Al atoms in the lunar
exosphere is depleted as compared to that of Na atoms.
