Schwestka Janine, Niggas Anna, Creutzburg Sascha, Kozubek Roland, Heller René, Schleberger Marika, Wilhelm Richard A, Aumayr Friedrich
Institute of Applied Physics, TU Wien, 1040 Vienna, Austria.
Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
J Phys Chem Lett. 2019 Sep 5;10(17):4805-4811. doi: 10.1021/acs.jpclett.9b01774. Epub 2019 Aug 9.
Low-energy electrons (LEEs) are of great relevance for ion-induced radiation damage in cells and genes. We show that charge exchange of ions leads to LEE emission upon impact on condensed matter. By using a graphene monolayer as a simple model system for condensed organic matter and utilizing slow highly charged ions (HCIs) as projectiles, we highlight the importance of charge exchange alone for LEE emission. We find a large number of ejected electrons resulting from individual ion impacts (up to 80 electrons/ion for Xe). More than 90% of emitted electrons have energies well below 15 eV. This "splash" of low-energy electrons is interpreted as the consequence of ion deexcitation via an interatomic Coulombic decay (ICD) process.
低能电子（LEEs）对于细胞和基因中的离子诱导辐射损伤具有重要意义。我们表明，离子的电荷交换会导致其撞击凝聚态物质时发射低能电子。通过使用石墨烯单层作为凝聚态有机物质的简单模型系统，并利用慢速高电荷离子（HCIs）作为入射粒子，我们突出了仅电荷交换对于低能电子发射的重要性。我们发现单个离子撞击会产生大量出射电子（对于Xe，高达80个电子/离子）。超过90%的发射电子能量远低于15电子伏特。这种低能电子的“飞溅”被解释为通过原子间库仑衰变（ICD）过程使离子去激发的结果。
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