Vortices in ionization collisions

详细信息    查看全文

• 作者：F. Navarrete ; R.O. Barrachina ; ^{barra@cab.cnea.gov.ar" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Positron impact ; Ionization ; Vortex
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：369
• 期：Complete
• 页码：72-76
• 全文大小：1042 K

文摘

We review the concept of quantum vortices and their appearance in ionization collisions. By relaxing the usual geometrical restrictions on the momenta of the final-state, we study these vortices as submanifolds of codimension 2 in the space where the transition matrix element T is defined. In particular, we exemplify their main characteristics by studying the ionization of hydrogen by positron impact. Previous calculation under a collinear geometry for impact energies larger than 270 eV have shown the presence of three isolated vortices. Here we demonstrate that they are produced by a single vortex line intersecting three times the corresponding two-dimensional collinear plane.