Extraction Voltage in Electron Source
- Practical Electron Microscopy and Database -
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Figure 2593 shows the ZLPs (zero-loss peaks) of a CFEG (cold field emission gun) [1] at various emission currents as well as the monochromatized ZLP [2] in logarithmic vertical scale. The inset lists the extraction voltages V1, probe currents Ip and the FWHMs (full width at half maximum) of the ZLPs. Note that the FWHMs quantify the energy spread. In general, the lower extraction voltage and probe current gives smaller FWHMs of the ZLPs, meaning that the higher energy resolution can be obtained, while the one with a monochromator still has the lowest FWHM.

ZLPs of CFEG under various emission conditions as well as the monochromatized ZLP

Figure 2593. ZLPs of CFEG under various emission conditions as well as the monochromatized ZLP. Adapted from [1]

 

 

 


[1] Koji Kimoto, Kazuo Ishizuka, Toru Asaka, Takuro Nagai, Yoshio Matsui, 0.23 eV energy resolution obtained using a cold field-emission gun and a streak imaging technique, Micron 36 (2005) 465–469.
[2] Kothleitner, G., Hofer, F., 2003. EELS performance measurements on a new high energy resolution imaging filter. Micron 34, 211–218.

 

 

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