FINE STRUCTURE OBSERVED IN MODIFIED X-RAY SCATTERING BY BORON

Using a double-crystal spectrometer, two portions of the spectrum of Cu Kα1, Kα2 radiation scattered by boron have been recorded. One portion is near the Rayleigh peaks; the other portion is at a distance of about 180 eV from the Rayleigh peaks. Several discontinuities have been noted in the first region. A definite double line has been observed in the second region at a distance from the Rayleigh lines which corresponds closely to the energy required for a 1s-2p electron transition. The widths of the observed lines are in agreement with the K boron emission lines. No conclusive results have yet been obtained with regard to the selection rules. It is not clear that the process under investigation is a three-level transition process. © 1969 The American Physical Society.