Energy redistribution in diatomic molecules on surfaces

Conference · Sun Apr 01 04:00:00 EST 1984

OSTI ID:6814176

Asscher, M; Somorjai, G A

Translational and internal degrees of freedom of a scattered beam of NO molecules from a Pt(111) single crystal surface were measured as a function of scattering angle and crystal temperature in the range 450 to 1250K. None of the three degrees of freedom were found to fully accommodate to the crystal temperature, the translational degree being the most accommodated and the rotational degree of freedom the least. A precursor state model is suggested to account for the incomplete accommodation of translational and vibrational degrees of freedom as a function of crystal temperature and incident beam energy. The vibrational accommodation is further discussed in terms of a competition between desorption and vibrational excitation processes, thus providing valuable information on the interaction between vibrationally excited molecules and surfaces. Energy transfer into rotational degrees of freedom is qualitatively discussed.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6814176
• Report Number(s): LBL-17670; CONF-8404166-1; ON: DE84011442
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR DISTRIBUTION
CHALCOGENIDES
COLLISIONS
CRYSTALS
DISTRIBUTION
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
METALS
MOLECULE COLLISIONS
MONOCRYSTALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
SCATTERING
TRANSITION ELEMENTS
VIBRATIONAL STATES