<div class="csl-bib-body">
<div class="csl-entry">Blödorn, F., Simperl, F., & Werner, W. (2023, June 12). <i>Measurements of electron affinity of PMMA with coincidence experiments and Monte Carlo simulations</i> [Presentation]. ÖGV-Seminar 2023, Wien, TU Wien, Austria.</div>
</div>
-
dc.identifier.uri
http://hdl.handle.net/20.500.12708/187667
-
dc.description.abstract
Secondary electron (SE) emission is a phenomenon important for technical applications as well as fundamental studies, but yet still not understood well enough today. We employ coincidence spectroscopy to study the SE emission mechanics and show that the coincidence spectra can be used to determine the electron affinity χ of insulating surfaces. This is essential for quantitative understanding of the secondary electron yield since it determines the width of the escape cone. Comparison with Monte Carlo calculations supports our interpretation. The influence of the surface barrier, the energy loss of the primary electron, the number of inelastic scattering events and their depths are investigated in some detail. The elastic and inelastic scattering cross sections σ and MFPs λ for the primary electron are well known. We determine the electron escape probability in dependence of the creation depth and the electron affinity with coincidence measurements and Monte Carlo simulations of Polymethylmethacrylate(PMMA). The coincidence measurement is built up as follows: An electron gun with very low output current I≈2.6 pA and acceleration voltage U= 173 V, i. e. E= 173 eV is directed towards a PMMA sample, where secondary electrons are produced and measured in coincidence with the back scattered primary electrons using a time of flight and an electrostatic analyser. The current is chosen low such that the ratio of true to false coincidences is optimised. Evaluation of the double differential coincidence spectrum provides a value for the electron affinity by means of two different types of analysis, which are in good mutual agreement.
en
dc.language.iso
en
-
dc.subject
nanotechnology
en
dc.subject
semiconductor
en
dc.subject
electron beams
en
dc.title
Measurements of electron affinity of PMMA with coincidence experiments and Monte Carlo simulations
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Presentation
-
tuw.researchTopic.id
M1
-
tuw.researchTopic.name
Surfaces and Interfaces
-
tuw.researchTopic.value
100
-
tuw.publication.orgunit
E134-01 - Forschungsbereich Applied and Computational Physics
-
tuw.publication.orgunit
E134 - Institut für Angewandte Physik
-
tuw.event.name
ÖGV-Seminar 2023
de
tuw.event.startdate
13-06-2023
-
tuw.event.enddate
13-06-2023
-
tuw.event.online
On Site
-
tuw.event.type
Event for scientific audience
-
tuw.event.place
Wien, TU Wien
-
tuw.event.country
AT
-
tuw.event.institution
Österreichische Gesellschaft für Vakuumtechnik (ÖGV)
-
tuw.event.presenter
Blödorn, Felix
-
wb.sciencebranch
Physik, Astronomie
-
wb.sciencebranch.oefos
1030
-
wb.sciencebranch.value
100
-
item.fulltext
no Fulltext
-
item.grantfulltext
restricted
-
item.cerifentitytype
Publications
-
item.cerifentitytype
Publications
-
item.openairetype
Presentation
-
item.openairetype
Vortrag
-
item.languageiso639-1
en
-
item.openairecristype
http://purl.org/coar/resource_type/c_18cf
-
item.openairecristype
http://purl.org/coar/resource_type/c_18cf
-
crisitem.author.dept
E130 - Fakultät für Physik
-
crisitem.author.dept
E134-01 - Forschungsbereich Applied and Computational Physics
-
crisitem.author.dept
E134-01 - Forschungsbereich Applied and Computational Physics