Donostia International Physics Center, Paseo Manuel Lardizabal 4, 20018 Donostia-San Sebastian, Spain.
J Phys Condens Matter. 2012 Mar 14;24(10):104022. doi: 10.1088/0953-8984/24/10/104022. Epub 2012 Feb 21.
A model is constructed to describe inelastic scattering events accompanying electron capture by a highly charged ion flying by a metallic nanosphere. The electronic energy liberated by an electron leaving the Fermi level of the metal and dropping into a deep Rydberg state of the ion is used to increase the ion kinetic energy and, simultaneously, to excite multiple surface plasmons around the positively charged hole left behind on the metal sphere. This tsunami-like phenomenon manifests itself as periodic oscillations in the kinetic energy gain spectrum of the ion. The theory developed here extends our previous treatment (Lucas et al 2011 New J. Phys. 13 013034) of the Ar(q+)/C(60) charge exchange system. We provide an analysis of how the individual multipolar surface plasmons of the metallic sphere contribute to the formation of the oscillatory gain spectrum. Gain spectra showing characteristic, tsunami-like oscillations are simulated for Ar(15+) ions capturing one electron in distant collisions with Al and Na nanoclusters.
构建了一个模型来描述伴随高度荷电离子飞过金属纳米球时的非弹性散射事件。电子从金属的费米能级离开并落入离子的深里德堡态时释放的能量用于增加离子的动能，并同时激发金属球上留下的正电荷孔周围的多个表面等离激元。这种海啸现象表现为离子动能增益谱中的周期性振荡。这里发展的理论扩展了我们之前对 Ar(q+)/C(60)电荷交换系统的处理（Lucas 等人，2011 年，《新物理学杂志》，13034）。我们分析了金属球的各个多极表面等离激元如何有助于形成振荡增益谱。对于在与 Al 和 Na 纳米团簇的远距离碰撞中捕获一个电子的 Ar(15+)离子，模拟了显示特征性海啸状振荡的增益谱。
