Abstract
The kinetics of the surface structure transition of Pt(110)1×1→1×2 is observed by LEED. The integral intensity of a superstructure spot is recorded as a function of time at various temperatures as the transition develops from the metastable 1×1 phase towards reconstruction. An initial fast increase is followed by a very slow growth which leads to a quasi-saturation level. Both the time constant and the magnitude of the level vary with temperature according to an activation energy of about 0.26 eV. Thermal equilibrium, i.e. full reconstruction is only approached at temperatures beyond 800 K. An Avrami type growth law fits the experiments only approximately but fails for long times and increasing temperatures.
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