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With the integrated 4D-STEM detector, the TESCAN MIRA™ and TESCAN CLARA™ scanning electron microscope lines provide a powerful and versatile platform, fully meeting the requirements for advanced workflows and applications in materials science.
Key Features and Benefits
- Shorten Time-to-Result: Optimize the evaluation and validation process of samples thanks to structural insights gathered directly on the SEM system.
- High Data Compatibility: The 4D-STEM datasets are fully compatible with current popular open-source software packages (e.g., LiberTEM, py4DSTEM, pixStem).
- Seamless Integration: The device is fully synchronized in both hardware and software on the MIRA™ and CLARA™ platforms, effectively serving advanced materials science analysis and applications.
- High-Resolution Imaging: Delivers sharp and highly detailed image quality.
- Protection of Beam-Sensitive Samples: Scanning Electron Microscopes (SEM) operate at lower acceleration voltages (30 keV or less) compared to traditional Transmission Electron Microscopes (TEM), making this system exceptionally suitable for analyzing beam-sensitive samples.
- Safe and Intuitive Operation: The detector mechanism features automated insertion and retraction fully integrated into the MIRA™ and CLARA™ platforms. Controlling the detector's in/out positioning is easily achieved with a single click via the TESCAN Essence™ control software.
Technical Specifications
| Property | Technical Details |
|---|---|
| Detector type | Solid state, hybrid pixel detector |
| Technology | Timepix 3 chip manufactured by AdvaScope, Peltier-cooled |
| Chip parameters | Pixel matrix: 256 × 256; Pixel size: 55 µm × 55 µm |
| Detection limit | From 5 keV and above |
| Readout throughput | High-speed processing capability, reaching 40 million hits·s⁻¹·cm⁻² |
| Acquisition mode | Data-driven |
| Control | Fully integrated into TESCAN Essence™ software, motorized movement control |
| Image acquisition |
|
| Protection | Integrated hardware beam shutter and safety interlocks. |
Frequently Asked Questions (FAQ)
Q1: What is 4D-STEM on an SEM system and how does it work?
Answer: 4D-STEM (4-Dimensional Scanning Transmission Electron Microscopy) is a technique where at each scanning point (X, Y position) on the sample, the detector records a complete 2D diffraction pattern (Kx, Ky position). This results in a 4-dimensional data cube.
On the TESCAN SEM system, the electron beam transmits through a thin specimen, and the resulting diffraction patterns are captured directly by the high-speed Timepix 3 hybrid pixel detector, allowing detailed mapping of the material's microstructure.
Q2: Which TESCAN microscope models are compatible with this 4D-STEM detector?
Answer: This detector is designed for seamless hardware and software integration on two high-resolution field emission scanning electron microscope (FE-SEM) lines: TESCAN MIRA™ (Schottky emitter FE-SEM) and TESCAN CLARA™ (Analytical FE-SEM).
Q3: What are the advantages of running 4D-STEM on an SEM compared to a traditional TEM?
Answer:
- Protection of Sensitive Samples: SEMs operate at much lower energy levels (typically 30 keV or less) than TEMs (typically 80–300 keV). This significantly reduces the risk of destroying the structure of beam-sensitive materials such as polymers, biological samples, or certain nanomaterials.
- Cost and Operation: Performing this technique on an SEM platform optimizes investment costs and offers a simpler operating workflow compared to a complex TEM system.
- Multi-tasking Capability: You can combine structural data from 4D-STEM with other SEM surface analyses (such as EDS, SE/BSE imaging) directly on the same instrument.
Q4: Is the output data format user-friendly?
Answer: Yes. The data cubes exported from the system are fully compatible with widely used, powerful open-source software packages in the materials science community, such as LiberTEM, py4DSTEM, and pixStem. Users can easily process, perform deep analysis, and reconstruct Bright-Field or Dark-Field images as desired using virtual apertures.
Q5: Is controlling the insertion and retraction of the detector complicated?
Answer: Not at all. The detector is equipped with a motorized mechanism and is directly integrated into the TESCAN Essence™ user interface. Users only need a single-click to automatically insert the detector into the operating position or retract it when not in use. The system also includes an integrated hardware shutter and safety interlocks to maximize detector protection.
Q6: What is the data acquisition speed of the Timepix 3 detector on this system?
Answer: The detector utilizes the Timepix 3 chip with a data-driven acquisition mode, delivering outstanding processing speeds of up to 40 million hits·s⁻¹·cm⁻². In live imaging mode, scanning speeds can reach 2 µs/pixel, significantly saving time-to-result.
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