Impact of local electrostatic field rearrangement on field ionization

Funding Agencies|IMPRS SurMat; EMC3 Labex; DYNAMITE project; CAMECA RINGAPT2 project
Field ion microscopy allows for direct imaging of surfaces with true atomic resolution. The high charge density distribution on the surface generates an intense electric field that can induce ionization of gas atoms. We investigate the dynamic nature of the charge and the consequent electrostatic field redistribution following the departure of atoms initially constituting the surface in the form of an ion, a process known as field evaporation. We report on a new algorithm for image processing and tracking of individual atoms on the specimen surface enabling quantitative assessment of shifts in the imaged atomic positions. By combining experimental investigations with molecular dynamics simulations, which include the full electric charge, we confirm that change is directly associated with the rearrangement of the electrostatic field that modifies the imaging gas ionization zone. We derive important considerations for future developments of data reconstruction in 3D field ion microscopy, in particular for precise quantification of lattice strains and characterization of crystalline defects at the atomic scale.

NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
field ionization; field evaporation; molecular dynamics; field ion microscope; electrostatic field; microscopy

Dagan, MichalUniv Oxford, England (författare)
Parviainen, StefanNormandie Univ, France (författare)
Nematollahi, AliMax Planck Inst Eisenforsch GmbH, Germany (författare)
Grabowski, BlazejMax Planck Inst Eisenforsch GmbH, Germany (författare)
Bagot, Paul A. J.Univ Oxford, England (författare)
Rolland, NicolasLinköpings universitet,Institutionen för teknik och naturvetenskap,Tekniska fakulteten(Swepub:liu)nicro31 (författare)
Neugebauer, JoergMax Planck Inst Eisenforsch GmbH, Germany (författare)
Raabe, DierkMax Planck Inst Eisenforsch GmbH, Germany (författare)
Vurpillot, FrancoisNormandie Univ, France (författare)
Moody, Michael P.Univ Oxford, England (författare)
Gault, BaptisteMax Planck Inst Eisenforsch GmbH, Germany (författare)
Max Planck Inst Eisenforsch GmbH, GermanyUniv Oxford, England (creator_code:org_t)

Av författaren/redakt...: Katnagallu, Shya ...; Dagan, Michal; Parviainen, Stef ...; Nematollahi, Ali; Grabowski, Blaze ...; Bagot, Paul A. J ...; visa fler...; Rolland, Nicolas; Neugebauer, Joer ...; Raabe, Dierk; Vurpillot, Franc ...; Moody, Michael P ...; Gault, Baptiste; visa färre...

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