scholarly journals First experimental results from a new high-power electron gun: Electron-impact ionisation of multiply charged xenon ions

2020 ◽  
Vol 1412 ◽  
pp. 152009
Author(s):  
B M Döhring ◽  
B Ebinger ◽  
A Borovik ◽  
K Huber ◽  
A Müller ◽  
...  
Keyword(s):  
Electron Impact ◽  
High Power ◽  
Experimental Results ◽  
Electron Gun ◽  
Multiply Charged ◽  
Impact Ionisation

Observation of Phase Contrast Images in STEM and CTEM Modes by Using 100 kV Field Emission Electron Gun

1974 ◽  
Vol 32 ◽  
pp. 390-391
Author(s):  
Y. Harada ◽  
T. Goto ◽  
H. Koike ◽  
T. Someya
Keyword(s):  
Field Emission ◽  
Phase Contrast ◽  
Image Formation ◽  
Fresnel Diffraction ◽  
Experimental Results ◽  
Electron Gun ◽  
Scanning Microscopy ◽  
Emission Electron ◽  
Lattice Images

Since phase contrasts of STEM images, that is, Fresnel diffraction fringes or lattice images, manifest themselves in field emission scanning microscopy, the mechanism for image formation in the STEM mode has been investigated and compared with that in CTEM mode, resulting in the theory of reciprocity. It reveals that contrast in STEM images exhibits the same properties as contrast in CTEM images. However, it appears that the validity of the reciprocity theory, especially on the details of phase contrast, has not yet been fully proven by the experiments. In this work, we shall investigate the phase contrast images obtained in both the STEM and CTEM modes of a field emission microscope (100kV), and evaluate the validity of the reciprocity theory by comparing the experimental results.

Electron Impact Ionisation of Be+

2018 ◽  
Vol 8 (4) ◽  
pp. 17-20
Author(s):  
Brij Mohan Prasad Singh ◽  
Sujeet Kumar ◽  
S. K. Shrivastava
Keyword(s):  
Electron Impact ◽  
Impact Ionisation

High-power high-convergence electron gun for an 11.424-ghz pulsed magnicon

2002 ◽  
Vol 30 (3) ◽  
pp. 1220-1231 ◽  
Author(s):  
O.A. Nezhevenko ◽  
V.P. Yakovlev ◽  
S.H. Gold ◽  
A.K. Kinkead
Keyword(s):  
High Power ◽  
Electron Gun

Multiple ionization of argon by positron impact

1996 ◽  
Vol 74 (7-8) ◽  
pp. 373-375 ◽  
Author(s):  
R. Hippler ◽  
S. Helms ◽  
U. Brinkmann ◽  
J. Deiwiks ◽  
H. Schneider ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Experimental Results ◽  
Positronium Formation ◽  
Positron Impact ◽  
Single Ionization ◽  
Multiple Ionization

Recent experimental results for the multiple ionization of argon by positron impact have been reanalysed. Absolute cross sections for the double and triple ionization of argon were obtained from measured ratios of double-to-single and triple-to-single ionization, using known cross sections for single ionization and for positronium formation. Distinct differences compared to similar results for electron impact are noted.

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