Kurzlebige Compoundzustände in der niederenergetischen Elektron-Helium-Streuung

Abstract

Electron scattering measurements have been made of the energy dependences of the excitation of the Helium 2 aS, 2 1S, 2 3p, and 2 1p states at different scattering angles in the range from 20 to 145 ~ In the energy range from 22 to 23 eV five overlapping resonances of the (e--He)-system have been determined, one of which (22.42 eV) is identified to be a 3 2S, another (22.60 eV) a 3 2p-state. The energy values of the other resonances are resp. 22.55, 22.75, and 22.85 eV. The half-widths are below approximately 40 meV. In the 2 3P-channel three peaks vanish at the same scattering angle, a fact, which seems not understandable in terms of first order resonance poles.Einleitung

Scaling Law of the Pinning Forces in Nonideal Type II Superconductors

“…Consequently, the true structure is masked by interference and it gives rise to irregular features in the excitation functions. One way to tackle this problem was suggested by Andrick et a[ (1968) by using electron scattering measurements. As a resonance is mainiy associated with one particuiar partiai wave, anguiar distribution analysis of the scattered electrons would reveal the configuration of this resonance.…”