ACCELERATED VAPOR GROWTH CAUSED BY ROUGHENING TRANSITIONS IN THE VICINAL AREAS OF RH(111) AND RH(110)

Vapour growth as a function of sample temperature was studied with FEM in the clean vicinal areas of Rh{lll) and Rh{11O}. A fairly steady gr owth was observed up to about 700 K: Classical growth at T<T-c (T-c=ro ughening transition temperature). The growth rate increased steeply at 720 K along the [211]) edges of {111} and at 680 K along the [100] ed ges of {110}: Accelerated growth at T>T-c.(T-c({110}/[211])=720 K;T-c( {110}/[100])=680 K.) (A roughening of the {110} face itself could not be observed.) The rapid growth at T greater than or equal to T-c is in agreement with a prediction by Burton and Cabrera (1949).