Accession Number : AD0746447

Title :   Total Cross Sections for Formation of Ions from CsBr by Collisions with Ar, Xe and NaBr(Ar).

Descriptive Note : Technical rept.,

Corporate Author : PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS

Personal Author(s) : Piper,L. G. ; Sloan,J. ; Hellemans,L. ; Ross,John

Report Date : JUL 1972

Pagination or Media Count : 44

Abstract : Measurements have been made by cross beam techniques on the absolute total cross section Q for formation of ions from CsBr in collisions with Ar and Xe, and relative total cross section for NaBr with Ar, in a range of relative kinetic energies (Xe: 12-120 eV; Ar: 20-125 eV). The absolute cross sections were obtained for CsBr. The energy dependence of the cross sections follows closely that predicted by the simple reaction model of hard spheres. A fit of this model to the measurements leads to estimates of threshold energies. Measurements have also been made on a crude energy analysis of the ions formed. Negative ions have somewhat lower energies than positive ones. The results are consistent with a knock-out model of collisional dissociation to ions, with a preference for dissociation by collision of the rare gas atom with the heavy (positive) end of the molecule. (Author)

Descriptors :   (*CESIUM COMPOUNDS, *GAS IONIZATION), (*DISSOCIATION, CESIUM COMPOUNDS), BROMIDES, IONS, DIFFERENTIAL CROSS SECTIONS, DIATOMIC MOLECULES, MOLECULAR BEAMS, ARGON, XENON

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE