Thumbnail
Access Restriction
Open

Author Shiozawa, Yuichiro ♦ Koitaya, Takanori ♦ Mukai, Kozo ♦ Yoshimoto, Shinya ♦ Yoshinobu, Jun
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ABSORPTION SPECTROSCOPY ♦ ACTIVATION ENERGY ♦ ATOMS ♦ COPPER ♦ DECOMPOSITION ♦ DESORPTION ♦ DISSOCIATION ♦ FORMATES ♦ FORMIC ACID ♦ HYDROGEN ♦ INFRARED SPECTRA ♦ LAYERS ♦ MOLECULES ♦ REFLECTION ♦ STABILIZATION ♦ SURFACES ♦ TIME RESOLUTION ♦ X-RAY PHOTOELECTRON SPECTROSCOPY
Abstract Quantitative analysis of desorption and decomposition kinetics of formic acid (HCOOH) on Cu(111) was performed by temperature programmed desorption (TPD), X-ray photoelectron spectroscopy, and time-resolved infrared reflection absorption spectroscopy. The activation energy for desorption is estimated to be 53–75 kJ/mol by the threshold TPD method as a function of coverage. Vibrational spectra of the first layer HCOOH at 155.3 K show that adsorbed molecules form a polymeric structure via the hydrogen bonding network. Adsorbed HCOOH molecules are dissociated gradually into monodentate formate species. The activation energy for the dissociation into monodentate formate species is estimated to be 65.0 kJ/mol at a submonolayer coverage (0.26 molecules/surface Cu atom). The hydrogen bonding between adsorbed HCOOH species plays an important role in the stabilization of HCOOH on Cu(111). The monodentate formate species are stabilized at higher coverages, because of the lack of vacant sites for the bidentate formation.
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-12-21
Publisher Place United States
Journal Journal of Chemical Physics
Volume Number 143
Issue Number 23


Open content in new tab

   Open content in new tab