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In-Lens Schottky Plus Field Emission Electron Gun

Higher brightness is achieved by optimizing the combination of the electron gun and low aberration condenser lens. Probe currents of a few pA to several tens of nA are obtained even with a low accelerating voltage by efficiently collecting the electrons generated by the gun, making it possible to perform high resolution observation as well as high-speed element mapping and EBSD on the nano-scale, while maintaining the smallest objective aperture.

Surface observation using GBSH (Gentle Beam Super High Resolution)

The existing *Gentle Beam (GB) has been improved to apply even higher voltages to the specimen, providing super-high resolution images with low accelerating voltages. GBSH allows you to select the accelerating voltage best suited to the application, from specimen surface observation to nano-scale element analysis.

*Gentle Beam(GB) is a technique of applying a bias voltage to the specimen to reduce the speed of the incident electrons, and accelerate the speed of the emitted electrons.

Top surface imaging using Gentle Beam

By applying a bias voltage to the specimen (GB), the speed of the incident electrons is reduced and the speed of the released electrons is increased. This allows high-resolution images with a good signal-to-noise ratio to be acquired even with low specimen landing voltage. If GBSH mode is used, which allows a higher bias voltage to be applied, higher-resolution observations can be made even at landing voltages of just a few tens of eV.

Acquisition of all information using multiple detectors

The JSM-7800F incorporates 4 types of detectors, including an upper electron detector (UED), upper secondary electron detector (USD), backscattered electron detector (BED), and a lower electron detector (LED). For the UED, the secondary electron and backscattered electron collection can be changed according to the filter voltage, making it possible to select the electron energy for image acquisition. The USD detects the low-energy electrons that are rejected by the filter grid. With the BED, channeling contrast –contrast can be clearly observed by detecting either high or low-angle backscattered electrons. The LED enables acquisition of images with a 3-dimensional appearance, including the surface roughness information from the illumination effects.