But does the oxidative effect of rare short-lived impact atmospheres match the other chemistry associated with being exposed to billions of years of hard (black

But does the oxidative effect of rare short-lived impact atmospheres match the other chemistry associated with being exposed to billions of years of hard (blackbody) sunlight, solar wind, and cosmic rays on the surface of a body without much of a magnetosphere? How much are those impact oxides, particularly the ones in fine dust, shorn of their chemical bonds?