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research
Gas cascade amplification in ultra-high-resolution environmental scanning electron microcopy
Authors
WR Knowles
BL Thiel
M Toth
Publication date
1 December 2010
Publisher
'Cambridge University Press (CUP)'
Doi
Cite
Abstract
We describe a feedback mechanism in the gas cascade amplification process used in magnetic immersion lens environmental scanning electron microcopy (ESEM). Feedback dominates gas gain under the conditions typically used for ultra-high-resolution ESEM and gives rise to novel dependencies of the imaging signal and noise on microscope operating parameters. It is ascribed tentatively to the generation of free electrons upon de-excitation of metastable species in the gas cascade. The results have implications for optimization of ESEM systems for applications such as critical dimension metrology and real-time imaging of nanostructure growth by gas mediated electron beam induced deposition. © Microscopy Society of America 2010
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Last time updated on 13/02/2017