Field-ion-microscope observations provide direct evidence that Pt adatoms replace Ni(110) surface atoms at temperatures above 105 K. The directions of the individual displacements in this replacement process are consistent with a model involving concerted motion of the adatom and substrate atom. The activation barrier for the exchange is estimated to be 0.28 eV.
- Received 19 March 1991
- Published in the issue dated 8 July 1991
© 1991 The American Physical Society