1,721,029 research outputs found
Zlepšení metody pro pozorování vodu obsahujících vzorků v EREM
No full textThe attention is in this work focused on setting up the conditions for complete dehydration of samples in the specimen chamber of ESEM, ensuring the nature state of a sample during the critical phase of pumping of a microscope
Imaging of the voltage contrast in environmental SEM
No full textCurrent methodology of imaging in the scanning electron microscopy is based on the detection of signal electrons that carry topografic and materialcontrast of specimens under study. Electronic devices can be observed because in their standard working mode voltage differences on component surfaces are visualized by means of the voltage contrast. This contrast can be acquired in nearly any commercially available scanning electron microscopeby detection and subsequent analysis of secondary electrons
Výpočty nízkonapěťového BSE detektoru
No full textThe scintillator-photomultiplier detection system installed under the pole piece represents the most efficient BSE detector in SEM. However, the initial energy of the BSEs of 0.5-3 keV in the LV SEM is the energy, on which the light yield of scintillators decreases. Appropriate acceleration of BSEs and declination of SEs is necessary for the best BSE image at low acceleration voltage. Electrostatic field affecting signal electron trajectories was simulated in the software package Simion 3D
Detectors for the study of contrast mechanisms of backscattered electrons in scanning electron microscopy
No full textDoplňkové hydratační metody pro pozorování vlhkých vzorku v ESEM
No full textHigher pressure of the water vapour creates optimum condition for the detection of SE by the secondary electron detector (SED) and ensures hydration of the water containing samples in the environmental scanning electron microscope
Nový detektor zpětně odražených elektronů pro nízkonapěťový SEM
No full textThis work deals with the description of the new scintillation detector of backscattered electrons for the low voltage scanning electron microscope
Combined scintillation and ionisation detectors for environmental scanning electron microscopes
No full textOne of the recent directions in the field of scanning electron microscopy deals with observation of specimens at higher pressures in the specimen chamber. Owing to the presence of the gaseous medium, charging effects are suppressed for specimens of insulation character, and at the same time the observation of biological specimens without their prior treatment is made possible. The constructed combined scintillation and ionisation detector extends the applications of these microscopes and enables copmarison of behaviour and properties of both detectors
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