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The adsorption of ethylene on the Si(111)(7×7) surface has been studied at 300 K using high-resolution electron energy loss spectroscopy. Assignments of the observed loss peaks are attempted. Ethylene is predominantly adsorbed non-dissociatively and is rehybridized to have a near sp³ hybridization state. The adsorbed structure is proposed in which ethylene is di-σ bonded to two adjacent surface Si atoms saturating the dangling bonds.