A sputtering derived atomic oxygen source for studying fast atom reactions
A novel technique for generation of fast atomic oxygen has been developed. These atoms are created by ion beam sputtering from metal oxide surfaces. Mass resolved ion beams at energies up to 60 KeV are produced for this purpose using a 150 cm Isotope Separator. Studies have shown that particles sputtered with 40 KeV Ar/sup +/ on Ta/sub 2/O/sub 5/ were dominantly neutral and exclusively atomic. The atomic oxygen also resided exclusively in its /sup 3/P ground-state. The translational energy distribution for these atoms peaked at ca 7 eV (the metal-oxygen bond energy). Additional measurements on V/sub 2/O/sub 5/ yielded a bimodal distribution with the lower energy peak at ca 5 eV coinciding reasonably well with the metal-oxygen bond energy. The 7 eV source was used to investigate fast oxygen atom reactions with the 2-butene stereoisomers. Relative excitation functions for H-abstraction and ..pi..-bond reaction were measured with trans-2-butene. The abstraction channel, although of minor relative importance at thermal energy, becomes comparable to the addition channel at 0.9 eV and dominates the high-energy regime. Structural effects on the specific channels were also found to be important at high energy. 11 refs., 2 figs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6710576
- Report Number(s):
- BNL-39373; CONF-8611131-2; ON: DE87006465
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ion sputtering on metal oxides: A source of translationally hot O(/sup 3/P/sub J/) atoms for chemical studies above 1 eV
Ion-beam characteristics of the metal cluster complex of Ir{sub 4}(CO){sub 12}
Related Subjects
Molecular & Chemical Physics-- Beams & their Reactions
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARGON IONS
ATOMIC BEAM SOURCES
CHALCOGENIDES
CHARGED PARTICLES
COLLISIONS
ELEMENTS
ENERGY RANGE
ION COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
NEUTRAL BEAM SOURCES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SPUTTERING
TANTALUM COMPOUNDS
TANTALUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES