Accession Number : AD0769296

Title :   Inelastic Collisions of Excited Atoms.

Descriptive Note : Annual rept.,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : Peterson,James R. ; Olson,Ronald E.

Report Date : 31 OCT 1973

Pagination or Media Count : 26

Abstract : Experimental and theoretical work has been directed to the understanding of interactions between atoms and molecules, where at least one of the reactants is initially electronically excited. During this report period experiments have been conducted to determine the He(2 triplet S) and He(2 singlet S) populations produced in reactions of He(+) + Cs at collision energies of 400 to 1000 eV. The results lead us to believe that either He(2 singlet S) is formed in only a low percentage of the collisions or that He(2 singlet S) is removed by collisions with Ar to the He(2 singlet P) state which radiates to the ground state of He. Experimental work is continuing to verify the reaction mechanism. Theoretical work has also been directed toward the problem of predicting the product state populations for charge transfer reactions leading to excited products. A theoretical model has been developed and applied to the He(+) + alkali systems. At this time there is reasonable agreement with experiment. (Author)

Descriptors :   (*Inelastic scattering, *Collisions), (*Helium, Inelastic scattering), Excitation, Atomic beams, Atomic energy levels, Alkali metals, Cesium, Ions, Charge transfer, Energy transfer, Gas ionization, Electron transitions

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE