2 results match your criteria: "Netherlands. Electronic address: molen@physics.leidenuniv.nl.[Affiliation]"
Low energy electron microscopy at cryogenic temperatures.
Ultramicroscopy
November 2023
Huygens-Kamerlingh Onnes Laboratorium, Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, P.O. Box 9504, RA Leiden NL-2300, Netherlands. Electronic address:
Article Synopsis
- The paper discusses a new cryogenic sample chamber designed for low energy electron microscopy (LEEM) and shares initial experimental findings.
- Modifications were made to the LEEM instrument to enable cooling mechanisms and minimize heat load, achieving sample temperatures as low as 15 K using liquid nitrogen and helium.
- Initial low-temperature LEEM experiments on a three-monolayer pentacene film revealed a significant decrease in electron beam damage at lower temperatures and changes in the LEEM-IV spectra, with explanations provided for these observations.
Extracting transverse electron mean free paths in graphene at low energy.
Ultramicroscopy
November 2023
Leiden Institute of Physics, Universiteit Leiden, Niels Bohrweg 2, Leiden, the Netherlands. Electronic address:
Article Synopsis
- The LEEM-IV spectra of few-layer graphene reveal specific energy minima that vary with the number of layers, while low-energy TEM spectra show transmission maxima at those corresponding energy levels.
- The observed patterns in both LEEM and TEM can be explained through electron wave function interference in an elastic scattering model.
- A new model is proposed that incorporates both elastic and inelastic scattering effects, allowing for a self-consistent extraction of Mean Free Path (MFP) values and a comparison with existing research.