Data for "Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS2 Probed by the Emission of Electrons"

Contents of this data set

This repository contains the processed experimental data as well as the evaluation procedure applied to create the figures published in "Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of  Graphene and MoS2 Probed by the Emission of Electrons". 

Context and methodology

• Highly charged ion neutralisation upon transmission through 2D materials is measured using the ion beam spectrometer at TU Wien. Data is recorded for the charge state evolution of the highly charged ions, as well as secondary electron yields and secondary electron energy distributions.
• Experimental data is compared for graphene and MoS2 samples. A Hubbard model is applied to simulate the energy dissipation in the materials upon ion impact.
• The data comprises coincidence measurement results in a list-mode fashion, i.e. for single impinging ions we record the impact position (x/y) on our 2D position-sensitive particle detector and the time of flight of the projectiles from sample to detector. Depending on the used detector, we additionally have information on the number of created secondary electrons (yield) or the electron energy. Potential energy deposition is accessible through established knowledge on ionisation energies of Xe ions.
• Simulation results include time-dependent charge densities in a graphene/MoS2 layer upon extraction of electrons from the center-hexagon of the sample flake, trajectory analysis calculations of (low-energy) electrons emitted from the sample in this time-dependent potential and G1–G2 simulations of the two materials to access the energy spectrum in the ground state and during the interaction.

Technical details

• The dataset includes one file in .dgraph-format (see below). All manuscript figures (excluding schematics) can be reproduced using this data file. The data inside the file is structured in a folder-tree labelled according to the content of the figure and/or the final (sub) figure number.
• DataGraph from Visual Data Tools is required to open this data set. The data was created using version 5.5.2beta.