RECONSTRUCTION DEPENDENT ADSORPTION OF C-60 ON GAAS(111)B

The interaction of C-60 with the (2 x 2) and (1 x 1)(LT) reconstructio ns of the GaAs(111)B surface has been studied using synchrotron radiat ion core-level and valence band photoemission. For the (2 x 2) phase. C-60 adsorption produces no change in either the lineshape or the ener gy position of the Ga 3d and As 3d core-levels. In contrast, the As 3d photoelectron spectrum of the (1 x 1)(LT) surface is considerably alt ered following the deposition of C-60. Our results indicate that the c haracter of C-60 adsorption may be changed from physisorption to chemi sorption via variations in surface reconstruction and stoichiometry. ( C) 1998 Elsevier Science B.V. All rights reserved.