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  3. ElectronStopping - Electronic stopping power from first principles

ElectronStopping - Electronic stopping power from first principles

ElectronStopping - Electronic stopping power from first principles
Funding Program
EU - FP7
Coordinator
CIC nanoGUNE - Spain
Call
FP7-PEOPLE-2012-CIG
Project ID
333813
PI at nanoGUNE
Emilio Artacho (e.artacho@nanogune.eu)
From
03/01/2014
To
28/02/2018
Total funding
100 000 €
Web
cordis.europa.eu/project/id/333813
Research group
Theory
The Electronstopping project is focused on the creation of a flexible and general method that will make possible to accurately calculate and analyze the electronic stopping power in a large variety of materials.

Ions traveling through matter at enough speed give rise to non-adiabatic processes by which the electrons of the system become excited. The quantitative understanding of these processes and the ability to reproduce them accurately on the computer is of direct relevance to, among others, the nuclear and space industries and to cancer radiotherapy with ions.

In spite of this importance, ab initio calculations of the electronic stopping power in materials represent a research field still to flourish. We have recently demonstrated the possibility of accurate calculation and analysis of such processes in two paradigmatic cases (light projectiles in LiF and in Au). The Electronstopping project proposes to establish the method with flexibility and generality, so that it can be applied to a large variety of systems by agents in the mentioned fields, while we explore the behavior of the electronic-excitation processes in a set of varied materials and situations.

We will start by simulating the electronic stopping of H and He in aluminum, to address recent interesting and unexplained experimental observations. We will then proceed to a systematic comparison of electronic stopping among insulating solids of different chemistries, studying the behavior of the threshold effect in the electronic stopping power when changing band gap and bond type. We will then explore the dependence of the electronic stopping power on impact parameter when in channeling conditions, allowing for trajectories to deviate from the channel direction along the way. Finally, we will study the electronic stopping power in liquid water, and in a guanine-cytosine nucleoside pair in water.

Partners

CIC nanoGUNE - Spain

Keywords
ab initio calculations
ion traveling
electronic stopping power
non-adiabatic processes
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