The temperature factor (B = 0.70 Å2) and atomic parameter (x = 0.305) were determined by comparing the observed and calculated powder diffraction data for synthetic β‐PbO2. This material is tetragonal with a = 4.961 (2), c = 3.385 (2) Å, and space group P4/mnm.
The intensity distributions of F Ka satellites produced by 84-MeV N 4+ bombardment displayed a significant chemical effect. The dependence of the intensity distributions of several fluorides on the chemical environment is discussed in relation to the Pauling bond ionicity or eovaleney. A refilling of vacancies by ligand valence electrons prior to the x-ray emission accounted for the observed satellite distributions for the compounds used.
Measurements were made, at various emission angles, of energy spectra of electrons from Al induced by grazing-angle-incident ions of N 6+ , Ar l2+ , and Xe 27+ with equal velocities corresponding to 0.98 MeV/amu. A new line which could not be explained by any of the hitherto identified mechanisms was observed at an energy obviously larger than that of an electron with a velocity equal to the projectile. The projectile and emission-angle dependences of the line are consistent with the dynamic-imagepotential acceleration mechanism.
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