Adsorption and decomposition of t-butylphosphine (TBP) on a GaP(0 0 1)-(2 × 1) surface studied by LEED, HREELS, and TPD

Adsorption and decomposition of t-butylphosphine (TBP: (CH3)3CPH2) on a GaP(0 0 1)-(2×1) surface have been studied by low-energy electron diffraction (LEED), high-resolution electron energy loss spectroscopy (HREELS), and temperature programmed desorption (TPD). It is found that most of TBP is partially dissociated into H and (CH3)3CPH at 350 K. The t-butyl radical and isobutylene are evolved from the surface at about 350–450 and 450–550 K, respectively. The activation energy for the radical was estimated to be about 101 kJ/mol. The result obtained, here, is different from that on a GaP(0 0 1)-(2×4) surface. The decomposition mechanism for TBP on the surface is discussed.