Fully differential cross sections for ionization of H2+ by ion impact: quantum and classical effects

C. A. TACHINO; R. D. RIVAROLA

Viña del Mar

Conferencia; IX Conferencia Latinoamericana de Colisiones Inelásticas en la Materia; 2018

Universidad Técnica Federico Santa María

The different mechanisms taking place during the ionization of an atomic or molecular target are closely related to the characteristic structures that appear in the corresponding fully differential cross sections. The study of the reaction as a whole and the analysis from both the classical and the quantum perspectives provides us with the necessary tools to interpret and understand the machinery behind this type of reaction.In this opportunity, single ionization of H2+molecular targets in both the ground (gerade) and first excited (ungerade) states by impact of bare ions is theoretically studied. To this end, fully differential cross sections (FDCS) are calculated by employing a two effective centre (TEC) approximation within the prior version of the Continuum Distorted Wave-Eikonal Initial State (CDW-EIS) formalism. It will be shown in this work that, under certain conditions, there is a competition between classical and quantum mechanisms in the ionization reaction that gives rise to a surprising effect: the binary and recoil peaks, two well-known structures associated with a classical collision picture, are completely erased from the ionization angular distribution. The existence of destructive quantum interferences due to the coherent electron emission of electrons from the neighborhood of both molecular centers may be held as the responsible for the suppression of these classical structures. Different behaviors are observed depending on whether the gerade or the ungerade states of the H2+molecular ion is analyzed. The same effect was previously observed for impact of light particles on the hydrogen molecular ion [1]. Different values of the projectile nuclear charge and incidence energy and several collision geometries are considered when calculating FDCS.References[1]O. A. Fojón, C. R. Stia, and R. D. Rivarola, Phys. Rev. A 84,(2011)032715.p { margin-bottom: 2.12mm; direction: ltr; color: rgb(0, 0, 0); }p.western { font-family: "Nimbus Roman No9 L", "Times New Roman", serif; font-size: 12pt; }p.cjk { font-family: "MS Mincho", "ＭＳ 明朝", serif; font-size: 12pt; }p.ctl { font-family: "Times", serif; font-size: 12pt; }a:visited { color: rgb(149, 79, 114); }a.western:visited { }a.cjk:visited { }a.ctl:visited { }a:link { color: rgb(0, 0, 255); }