ANISOTROPY OF ORDERING KINETICS IN A SINGLE-PHASE ADSORBED FILM - C(2X2)O-MO(011)

Kinetics of ordering in the c(2 X 2)O-Mo(011) system after temperature upquench is investigated by video low-energy electron diffraction. Va riation of domain size is analyzed on the basis of the first moment of the structure function. We observed an anisotropy in the domain growt h rate having anomalous orientation. The rate constant for the [001] d irection is 1.5 times as large as that for the [011] one. The ratio is independent of temperature, i.e., the activation energies for orderin g in the two directions are the same. The growth kinetics is character ized by a power law with the exponent x = 1/2 for both directions. [S0 163-1829(97)08040-5].