Low-kilovolt coherent electron diffractive imaging instrument based on a single-atom electron source
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China)
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan (China)
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan (China)
In this work, a transmission-type, low-kilovolt coherent electron diffractive imaging instrument was constructed. It comprised a single-atom field emitter, a triple-element electrostatic lens, a sample holder, and a retractable delay line detector to record the diffraction patterns at different positions behind the sample. It was designed to image materials thinner than 3 nm. The authors analyzed the asymmetric triple-element electrostatic lens for focusing the electron beams and achieved a focused beam spot of 87 nm on the sample plane at the electron energy of 2 kV. High-angle coherent diffraction patterns of a suspended graphene sample corresponding to (0.62 Å){sup −1} were recorded. This work demonstrated the potential of coherent diffractive imaging of thin two-dimensional materials, biological molecules, and nano-objects at a voltage between 1 and 10 kV. The ultimate goal of this instrument is to achieve atomic resolution of these materials with high contrast and little radiation damage.
- OSTI ID:
- 22489811
- Journal Information:
- Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films, Vol. 34, Issue 2; Other Information: (c) 2015 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0734-2101
- Country of Publication:
- United States
- Language:
- English
Similar Records
Future of Electron Scattering and Diffraction
Ultrafast Coherent Diffractive Imaging at FLASH