The adsorption of cyclic hydrocarbons on Ru(001): I. Cyclopropane☆
Review articleOpen access

AbstractThe adsorption of cyclopropane on Ru(001) at 90 K has been investigated by high-resolution electron energy loss spectroscopy, He I photoelectron spectroscopy, low-energy electron diffraction and thermal desorption mass spectrometry. The results indicate that the molecule adsorbs nondissociatively without long-range order and that no opening of the carbon ring occurs. The adsorption bond is weak, and multilayers form at 90 K only in the presence of a relatively high c-C3H6 equilibrium pressure. The vibrational spectrum is characterized by strong, dipole-active ring deformation modes and an additional mode at 570 cm−1, which is due to a frustrated translation of the admolecule perpendicular to the surface with some ring deformation character. The photoelectron spectrum is characterized by a Jahn-Teller splitting of the 3e' molecular orbital, which is observed also in the gas phase. With the exception of a uniform relaxation shift, no other shifts could be observed in comparison with the gas phase. The results are discussed in relation to possible bonding mechanisms.

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