Molecular beam studies of energy transfer in scattering from crystal surfaces

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6217968

Guthrie, W L

The translational energy distributions and angular distributions of D/sub 2/O produced from the reaction of incident D/sub 2/ and O/sub 2/ on a (111) platinum single crystal surface have been measured through the use of a molecular beam-surface scattering apparatus equipped with a time-of-flight spectrometer. The translation energies were measured over the surface temperature range T/sub s/ = 664 K - 913 K and at scattering angles of 7/sup 0/ and 40/sup 0/ from the surface normal. The D/sub 2/O translational energy, , was found to be approximately half the equilibrium value over the temperature range examined, with /2k varying from 280 K to 480 K. These results are discussed in terms of a non-equilibrium desorption model. The two-photon ionization spectrometer was built to investigate the internal rotational and vibrational energy distributions of NO scattered from Pt(111) surfaces. The rotational energy distributions were measured over the crystal temperature range of T/sub s/ = 400 K - 1200 K. The translational energy distributions and angular distributions were measured using the time-of-flight spectrometer over the crystal temperature range of 400 K - 110 K and for beam translational energies of 0.046 eV, 0.11 eV and 0.24 eV, so that complete energy exchange information for translation, rotation and vibration is available for this gas-surface system. Significant energy transfer was observed in all three modes.

• Research Organization: California Univ., Berkeley (USA)
• OSTI ID: 6217968
• 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
DATA
DEUTERIUM
DISTRIBUTION
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
EXPERIMENTAL DATA
HYDROGEN ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
METALS
MOLECULES
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
ROTATIONAL STATES
SCATTERING
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
VIBRATIONAL STATES