Energy redistribution among internal states of nitric oxide molecules upon scattering from Pt(111) crystal surface

Journal Article · Wed Jun 01 04:00:00 EDT 1983 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.444647· OSTI ID:6050485

Asscher, M; Guthrie, W L; Lin, T; Somorjai, G A

The internal states distributions rotation and vibration of nitric oxide molecules scattered from the Pt(111) crystal surface are reported. These distributions were measured as a function of crystal temperature (T/sub s/) and scattering angles. The extent of equilibration of the three degrees of freedom, e.g., translation, rotation, and vibration with the metal surface is discussed in terms of the energy accommodation coefficients ..gamma... It was found that ..gamma../sub trans/>..gamma../sub vib/>..gamma../sub rot/. A model is suggested to account for the cold rotational distribution of molecules scattered via a trapping desorption mechanism. The vibrational distributions are determined by kinetic effects and by the competition between vibrational excitation of the adsorbed molecules and their desorption.

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory
• OSTI ID: 6050485
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CHALCOGENIDES
COLLISIONS
DISTRIBUTION
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
METALS
MOLECULE COLLISIONS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
ROTATIONAL STATES
SURFACES
TRANSITION ELEMENTS
VIBRATIONAL STATES