Real-time imaging of surface evolution driven by variable-energy ion irradiation.
W Swiech1, M Rajappan, M Ondrejcek
1Frederick-Seitz Materials Research Laboratory, Center for Microanalysis of Materials, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. wswiech@express.cites.uiuc.edu <wswiech@express.cites.uiuc.edu>
Ultramicroscopy
|December 8, 2007
Summary
A new tandem instrument combines low-energy electron microscopy (LEEM) and a negative ion accelerator for real-time surface imaging during ion irradiation. This allows detailed study of surface microtopography evolution under extreme conditions.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Understanding surface evolution during ion irradiation is crucial for materials science.
- Real-time imaging techniques are needed to capture dynamic surface changes.
- High temperatures and controlled ion bombardment are key experimental parameters.
Purpose of the Study:
- To introduce a novel tandem instrument integrating Low-Energy Electron Microscopy (LEEM) with a negative ion accelerator.
- To enable high-resolution, video-rate imaging of surface microtopography dynamics during energetic ion irradiation.
- To investigate material behavior under controlled irradiation and high-temperature conditions.
Main Methods:
- Design and implementation of a combined LEEM and negative ion accelerator system.
- Utilizing video-rate imaging to capture surface evolution.
- Performing self-ion irradiation experiments on Pt(111) and Si(001) at temperatures up to 1700 K.
- Operating the LEEM at a base pressure in the 10(-9) Pa range.
Main Results:
- The instrument successfully provides real-time imaging of surface microtopography changes during ion irradiation.
- Demonstrated capability to study dynamic processes at temperatures up to 1700 K.
- Presented experimental data from self-ion irradiation of Platinum (Pt) and Silicon (Si) surfaces.
Conclusions:
- The developed tandem instrument is effective for studying ion-induced surface dynamics.
- This technology opens new avenues for in-situ analysis of materials under irradiation.
- The findings provide insights into the evolution of surface microstructures during energetic ion bombardment.
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