title: Lateral Hopping of CO on Ag(110) by Multiple Overtone Excitation.
abstract: A novel type of action spectrum representing multiple overtone excitations of the v(M-C) mode was observed for lateral hopping of a CO molecule on Ag(110) induced by inelastically tunneled electrons from the tip of a scanning tunneling microscope. The yield of CO hopping shows sharp increases at 261±4  mV, corresponding to the C-O internal stretching mode, and at 61±2, 90±2, and 148±7  mV, even in the absence of corresponding fundamental vibrational modes. The mechanism of lateral CO hopping on Ag(110) was explained by the multistep excitation of overtone modes of v(M-C) based on the numerical fitting of the action spectra, the nonlinear dependence of the hopping rate on the tunneling current, and the hopping barrier obtained from thermal diffusion experiments.
authors.affiliation: Surface and Interface Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Junepyo
authors.initials: J
authors.lastname: Oh
authors.affiliation: Surface and Interface Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.|Department of Chemistry, UNIST, UNIST-gil 50, Ulsan 689-798, Republic of Korea.|Center for Multidimensional Carbon Materials, Institute of Basic Science, UNIST-gil 50, Ulsan 689-798, Republic of Korea.
authors.forename: Hyunseob
authors.initials: H
authors.lastname: Lim
authors.affiliation: International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 304-0044, Japan.
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Arafune
authors.affiliation: Surface and Interface Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.|Department of Chemistry, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 680-749, Republic of Korea.
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Jung
authors.affiliation: Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8651, Japan.
authors.forename: Maki
authors.initials: M
authors.lastname: Kawai
authors.affiliation: Surface and Interface Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Yousoo
authors.initials: Y
authors.lastname: Kim