ained numerically by Takeo" appear to belong to a very general type of effect, namely, the interference resulting from the existence of several paths, in this case two, connecting initial and final states.This "two path interference, " the archetype of which is met in the diffraction of particles (or waves) through two slits, is also responsible for the nodal structure of the wave function, as seen in Sec. II, and for interference fringes in the differential scattering cross section. What is perhaps particular to the case of the spectrum is that the different paths are distinguished by a temporal parameter rather than by a spatial one as is more common, and one might speak of a "two slits in time" interference effect, as is suggested by the pictorial representation of Fig. 2. ACKNOWLEDGMENTS
The K-Ionization Cross Section of Carbon by Electron Impact (2-30 keV)The K-ionization cross section of carbon by electron impact was measured detecting quantitatively the C-K X-rays emitted by thin solid targets of known mass thickness. The experimental method and the measurements are described.The measurements confirm the result of Glupe and Mehlhorn 1,2 in the absolute values, but in respect to the relative shape of the ionization function their result is somewhat different.The comparison with theory shows very good agreement with the semi-empirical calculation of Gryzinski 3. Quantummechanical theories disagree, if they describe the impact electron by plane waves. The theory of Rudge and Schwartz 4, which uses Coulomb wave fanctions for the impact electron, is in reasonably good agreement with the experiment at the lower energies; at hundred-fold threshold energy this theory is about 25 % higher.
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