Electron interactions with Ar clusters and liquid Ar

Francisco Blanco,Gustavo García

doi:10.1088/1742-6596/438/1/012012

Abstract

Differential and integral electron scattering cross section from some Ar clusters (dimer, trimer and tetramer) are calculated for incident energies ranging from 1 to 500 eV by using a screening corrected additivity rule based on an independent atom representation (IAM-SCAR). The possibility of using this method to derive electron scattering cross section in the liquid phase is discussed and electron scattering cross section data for Ar liquid are provided.

Highlights

Secondary electrons have been proved to be responsible for the energy deposition pattern and related damage when irradiating matter with different high energy particles
To construct this complex potential for each atom, the real part of the potential is represented by the sum of three terms: (i) a static term derived from a Hartree-Fock calculation of the atomic charge distribution [6], (ii) an exchange term to account for the indistinguishability of the incident and target electrons [7] and (iii) a polarisation term [8] for the long-range interactions which depend on the target dipole polarisability [9]
Differential electron elastic scattering cross section for Ar atom, dimer, trimer and tetramer are shown in Table 1 and plotted in Figure 2 for selected energies ranging from 1 to 1000 eV

Summary

Introduction

Secondary electrons have been proved to be responsible for the energy deposition pattern and related damage when irradiating matter with different high energy particles (photons, electrons, positrons or ions). In addition accurate theoretical and experimental cluster geometrical configurations for its dimmer, trimmer and tetramer have been recently published [1,2] This allows us to apply our screening corrected additivity rule (SCAR) [3,4,5,6] to an independent atom representation (IAM) in order to follow the evolution of the differential (DCS) and integral (ICS) scattering cross section as a function of the number of atoms forming the cluster. This can be regarded as the way that atom condensation affects to the single atom scattering cross sections. We can model the liquid state as a large cluster by assuming a homogeneous atom distribution defined by its density

Objectives

Methods

Results

Conclusion