Interaction of highly charged ions with carbon nano membranes

29th International Conference on Photonic, Electronic, and Atomic Collisions

Gruber, Elisabeth^1 ; Wilhelm, Richard A.^2 ; Smejkal, Valerie^1 ; Heller, René^2 ; Facsko, Stefan^2 ; Aumayr, Friedrich^1

Institute of Applied Physics, TU Wien, Wiedner Hauptstraße 8-10/E134, Vienna

1040, Austria^1

Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden- Rossendorf, Bautzner Landstr. 400, Dresden

01328, Germany^2

关键词: Charge state distribution;    Helium ion microscopies;    High-resolution imaging;    Highly charged ions;    Impact-parameter;    Loss measurement;    Slow highly charged ions;    Transmission measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/1/012027/pdf
DOI  :  10.1088/1742-6596/635/1/012027

来源: IOP

【 摘 要 】

Charge state and energy loss measurements of slow highly charged ions (HCIs) after transmission through nanometer and sub-nanometer thin membranes are presented. Direct transmission measurements through carbon nano membranes (CNMs) show an unexpected bimodal exit charge state distribution, accompanied by charge exchange dependent energy loss. The energy loss of ions in CNMs with large charge loss shows a quadratic dependency on the incident charge state, indicating charge state dependent stopping force values. Another access to the exit charge state distribution is given by irradiating stacks of CNMs and investigating each layer of the stack with high resolution imaging techniques like transmission electron microscopy (TEM) and helium ion microscopy (HIM) independently. The observation of pores created in all of the layers confirms the assumption derived from the transmission measurements that the two separated charge state distributions reflect two different impact parameter regimes, i.e. close collision with large charge exchange and distant collisions with weak ion-target interaction.