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All previous experimental and theoretical studies of molecular interactions at metal surfaces show that electronically nonadiabatic influences increase with molecular velocity. Here, we report the observation of a nonadiabatic electronic effect that follows the opposite trend: the probability for electron emission from a low work function surface -Au(111) capped by half a monolayer of Cs -increases as the velocity of the incident NO molecule decreases in the course of collisions with highlydoi:10.1126/science.1160040 pmid:18755972 fatcat:wvvqivmpljfipd7k7e4vp2ilmy