Počet záznamů: 1
Effective IMFP of thin samples via the time-of-flight method
- 1.
SYSNO ASEP 0567527 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Název Effective IMFP of thin samples via the time-of-flight method Tvůrce(i) Zouhar, Martin (UPT-D) ORCID, RID, SAI
Daniel, Benjamin (UPT-D) RID
Konvalina, Ivo (UPT-D) RID, ORCID, SAI
Paták, Aleš (UPT-D) RID, ORCID, SAI
Piňos, Jakub (UPT-D) RID, ORCID, SAI
Materna Mikmeková, Eliška (UPT-D) ORCID, RID, SAIZdroj.dok. 16th Multinational Congress on Microscopy, 16MCM, 04-09 September 2022, Brno, Czech Republic. Book of abstracts. - Brno : Czechoslovak Microscopy Society, 2022 / Krzyžánek V. ; Hrubanová K. ; Hozák P. ; Müllerová I. ; Šlouf M. - ISBN 978-80-11-02253-2
S. 168Poč.str. 1 s. Forma vydání Online - E Akce Multinational Congress on Microscopy /16./ Datum konání 04.09.2022 - 09.09.2022 Místo konání Brno Země CZ - Česká republika Typ akce WRD Jazyk dok. eng - angličtina Země vyd. CZ - Česká republika Klíč. slova time‑of‑flight spectrometer ; SLEEM ; inelastic mean free path Vědní obor RIV JA - Elektronika a optoelektronika, elektrotechnika Obor OECD Electrical and electronic engineering CEP GA22-34286S GA ČR - Grantová agentura ČR Institucionální podpora UPT-D - RVO:68081731 Anotace We built a custom ultra-high vacuum scanning low energy electron microscope. It allows us to measure transmitted electron spectra using the time-of-flight (TOF) method. The cathode-lens
principle, applying voltage bias to the sample (stage), allows us to measure at different landing energies ranging from 5 keV down to few eV. The setting of the voltages on active components can be optimised with respect to different quantities, e.g. length of the TOF spectra in the time-domain, keeping detected momentum transfer comparable across different landing energies etc. We reconstruct the hyper-spectral data, TOF spectrum for each pixel in each scan of selected frames, from the collected primary data - a set of timestamps. Single TOF spectrum is obtained by selecting the region of interest, pixels corresponding to the best quality of the sample, and simply adding up the spectra from all the selected pixels. We present the methodology of the data processing and results obtained for a commercial single-layer graphene sample from the Ted Pella company. The experimental data were complemented by the density-functional theory and the many-body perturbation theory simulations and they corroborate our measurements and data processing methods. We use the experimental data to estimate inelastic mean free path (IMFP) using the log-ratio method to sample the energy-profile of the IMFP within the regime of low landing energies. The resulting effective IMFP values for a single-layer graphene are in good agreement with existing literature. We plan to study other 2D and thin materials of scientific and commercial interest as well.Pracoviště Ústav přístrojové techniky Kontakt Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Rok sběru 2023 Elektronická adresa https://www.16mcm.cz/wp-content/uploads/2022/09/16MCM-abstract-book.pdf
Počet záznamů: 1