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Published on: August 8, 2019
Development of a momentum microscope for time resolved band structure imaging
B Krömker1, M Escher, D Funnemann
1Omicron Nanotechnology GmbH, 65232 Taunusstein, GermanyFocus GmbH, 65510 Hünstetten, Germany.
The Review of Scientific Instruments
|June 3, 2008
Summary
We developed a novel photoelectron microscope with an imaging energy filter for high-resolution electron detection. This instrument achieves below 100 ps time resolution, enabling detailed studies of material properties.
Area of Science:
- Surface Science
- Materials Science
- Spectroscopy
Background:
- Momentum-resolved photoelectron spectroscopy is crucial for understanding electronic band structures.
- Existing techniques often face limitations in combining spatial, momentum, energy, and time resolution.
- Advancements are needed to probe dynamic processes in materials.
Purpose of the Study:
- To present a novel photoelectron microscope design integrating an imaging energy filter.
- To demonstrate the capability of achieving simultaneous spatial, momentum, energy, and time resolution.
- To showcase the instrument's potential for advanced surface science investigations.
Main Methods:
- Utilizing a novel photoelectron microscope design with an integrated imaging energy filter.
- Employing a time-resolved imaging detector for photoelectron analysis.
- Performing angle-resolved ultraviolet photoelectron spectroscopy (ARUPS) on a Cu(111) sample.
Main Results:
- Achieved time resolution below 100 picoseconds.
- Successfully imaged the complete ARUPS pattern of Cu(111) in parallel and energy-resolved.
- Observed the Shockley surface state and electron-electron interactions (correlation hole) in momentum space.
Conclusions:
- The developed instrument offers unprecedented capabilities for time-resolved ARUPS.
- It enables detailed studies of dynamic phenomena like chemical reactions, film growth, and phase transitions.
- Future applications include time and polarization-resolved ARUPS for probing band structure changes.
