Suppression of binary and recoil peaks in ionization of H2 by electron impact

O. A. FOJÓN; C. R. STIA; R. D. RIVAROLA

Valparaíso

Congreso; V Encuentro Sudamericano de Colisiones Inelásticas en la Materia; 2010

Universidad Técnica Federico Santa María

We focus here on electron emission at high impact energies from fixed-in-space H2 molecules impacted by fast electrons. We study transitions at fixed equilibrium internuclear distance from the ground state of H2 to the ground (gerade) and first excited (ungerade) state of the H2+ residual target. We consider coplanar geometries in which the incident, scattered and ejected momenta lie all in the same plane. In addition, we analyze asymmetric kinematics situations in which one slow and one fast electron are detected in the final channel. We show here for the first time that under definite conditions, destructive interferences coming from the coherent emission from both molecular centers provoke the supression of the binary peak in the multiple differential cross sections corresponding to transitions leading to final ground state of H2+.