title: Scattering of O₂ from a graphite surface.
abstract: Recently an extensive series of measurements has been presented for the angular distributions of oxygen molecules scattered from a graphite surface. Incident translational energies ranged from 291 to 614 meV with surface temperatures from 150 to 500 K. The measurements were taken with a fixed angle of 90° between the source beam and the detector and the angular distributions consisted of a single broad peak with the most probable intensity located at an angle slightly larger than the 45° specular position. Analysis with the hard cubes model for atom-surface scattering indicated that the scattering is primarily a single collision event with a surface having a collective effective mass much larger than a single carbon atom. Limited analysis with a classical diatomic molecular scattering theory was also presented. In this paper a more complete analysis using the classical diatomic molecular scattering theory is presented. The energy and temperature dependence of the observed angular distributions are well described as single collision events with a surface having an effective mass of 1.8 carbon graphite rings. In agreement with the earlier analysis and with other experiments, this suggests a large cooperative response of the carbon atoms in the outermost graphene layer.
authors.affiliation: Physical Sciences Department, Greenville Technical College, Greenville, SC 29606, USA. Wayne.Hayes@gvltec.edu
authors.forename: W W
authors.initials: WW
authors.lastname: Hayes
authors.forename: Junepyo
authors.initials: J
authors.lastname: Oh
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kondo
authors.forename: Keitaro
authors.initials: K
authors.lastname: Arakawa
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Saito
authors.forename: Junji
authors.initials: J
authors.lastname: Nakamura
authors.forename: J R
authors.initials: JR
authors.lastname: Manson