INVESTIGADORES
RIVAROLA Roberto Daniel
artículos
Título:
Bethe binary-encounter peaks in the double-differential cross sections for high-energy electron-impact ionization of H2 and He
Autor/es:
S. CHATTERJEE, A.N. AGNIHOTRI, C.R. STIA, O.A. FOJÓN, R.D. RIVAROLA Y L.C. TRIBEDI
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2010 vol. 82 p. 527091 - 527096
ISSN:
1050-2947
Resumen:
We study the Bethe binary-encounter (BE) region in the ejected-electron double-differential emission spectrum
of H2 and He targets in collisions with 8-keV electrons. We compare the absolute cross sections for these
isoelectronic systems at high emission energies. The experimental data are analyzed in terms of a state-of-the-art
theoretical model based on a two-effective-center approximation. In the case of the H2 molecule the binary peak
in the double-differential cross sections (DDCS) is enhanced due to the two-center Young-type interference. The
observed undulation in the DDCS ratio is explained in terms of the combined contributions of the Compton profile
mismatch and the interference effect. The influence of the interference effect is thus observed for higher-energy
electrons compared to most of the earlier studies which focused on low-energy electrons produced in soft
collisions.