title: Trapping-mediated chemisorption of ethylene on Si(001)-c(4 x 2).
abstract: Adsorption of ethylene molecules on Si(001)-c(4 x 2) was studied using scanning tunneling microscopy at low temperatures. Ethylene molecules trapped at the surface at 50 K were imaged only after decay to chemisorption, each bonding to a Si dimer. Atomic-scale observations of temperature-dependent kinetics show that the decay exhibited Arrhenius behavior with the reaction barrier of 128 meV in clear evidence of the trapping-mediated chemisorption, however, with an anomalously small preexponential factor of 300 Hz. Such a small prefactor is attributed to the entropic bottleneck at the transition state caused by the free-molecule-like trap state.
authors.affiliation: Department of Physics, Yonsei University, Seoul 120-749, Republic of Korea.
authors.forename: Chun-Hyung
authors.initials: CH
authors.lastname: Chung
authors.forename: Woo-Jin
authors.initials: WJ
authors.lastname: Jung
authors.forename: In-Whan
authors.initials: IW
authors.lastname: Lyo