Hyperthermal K–TeF6 molecular beam scattering

Angular distributions of K+ product ions from collisions of a beam of hyperthermal K atoms with a cross beam of thermal K–TeF6 molecules were determined at 13.7 and 23.7 eV (lab). The angular yields of K atom products from the same system were too low to permit measurement of angular distributions. From the integrated yields, the K+ ion/K atom branching ratio was determined to be greater than 103. In addition to the extremely large branching ratio, the differential cross sections exhibited several other unusual characteristics: (a) the lack of small angle scattering, corresponding to virtual absence of covalent scattering, (b) two peaks in the differential cross section with an outer rainbow feature at very large scattering angles (∼275  eV deg). The observations are unexpected from previous experimental and theoretical studies of electron transfer reactions and from the electronic and structural properties of TeF6 and TeF6−. A simplified dynamics model based on formation of electronically excited TeF6− i...

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