Abstract
Adsorption of t-butylphosphine (TBP: (CH 3) 3CPH 2) on a GaP(001)-(2×4) surface has been studied by high resolution electron energy loss spectroscopy (HREELS) and scanning tunneling microscopy. The HREELS result suggests that most of TBP molecules are dissociated into (CH 3) 3CPH and H on the surface at room temperature. It is found that all the (CH 3) 3CPH molecules are located at an edge of Ga dimer protrusions in the (2×4) unit cell. This result supports our ‘one Ga dimer model’ and excludes the ‘two Ga dimer model’.
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