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Approach, contact, and bonding processes between different kinds of materials, gold (Au) and zinc oxide (ZnO) nanocrystallites were observed at atomic scale and at time resolution of 1/60 s. The nanocrystallites contact spontaneously when they approach at a few atomic distances under an intense electron irradiation. It was found that a Au/ZnO interface forms at ambient temperature without any sintering aid after the contact. © 1997 American Institute of Physics.