ИСТИНА

An advanced model of physico-chemical processes during collisions between meteoroids and the Moon was developed. In this model condensation of refractory elements in the form of minerals is considered and variable adiabatic index during expansion of impact-produced clouds is taken into account. Quenched chemical composition of impact-produced clouds is estimated. In accordance with this model relative fraction of atoms delivered to the lunar exosphere by impacts of meteoroids is significantly higher than that estimated with usage of the previous model with constant adiabatic index and without considering condensation. This model is also applied for studies of collisions between meteoroids and Mercury.