Đầu dò Nion ULTRASTEM
Atomic-resolution 4D imaging and elemental mapping of materials
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- Operating voltage from 30 to 200 kV
- Open-source Python-powered control software
- High-brightness/high-stability cold field emission electron gun (CFEG)
- High-performance C3/C5 aberration correction
- Ultra-high vacuum at the sample
- 4D-STEM capability
Annular dark field (ADF) image of monolayer boron nitride containing atomic substitutions. Quantitative analysis of the image produced a detailed atomic model, which is shown superimposed on the image. Boron atoms are shown red, carbon atoms yellow, nitrogen atoms green and oxygen atoms blue. (Graphic courtesy Tim Pennycook, ORNL & Vanderbilt U.)
Nion ULTRASTEM Specifications
| Feature | Benefit |
| >1 nA current in a 2 Å probe | Rapid atomic-resolution Electron Energy Loss Spectroscopy (EELS) elemental mapping |
| 0.8 Å high angle annular dark field (HAADF) resolution | Resolve fine spacings and single atoms |
| Correction of all fifth-order axial aberrations | Larger probe angles, higher beam current |
| Every operation can be performed remotely | Remote operation with no local assistance |
| Friction-free, centro-symmetric sample stage | Ultra-precise sample motion, freedom from drift |
| Double tilt sample holder using ball bearings | Backlash-free, ultra-precise tilting |
| Fast electrostatic beam blanker | Avoids sample damage when not collecting data |
| 5th-order-corrected EELS optics | >50 mr acceptance semi-angles, more efficient analysis |
| Microscope column is entirely ion-pumped | Minimizes sample contamination and etching |
| Column uses only metal vacuum seals | Sample vacuum typically <1×10-9 torr |
| Whole column bakeable to 140°C | Eliminates microscope-caused contamination |
| Double μ-metal shielding of entire column | Minimizes sensitivity to stray AC fields |
| Completely modular construction | Customization of the microscope column is possible |
| Self-diagnosing electronics | Rapid remote servicing |
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