Molecular ionization probability in cluster-SIMS

2018 ◽  
Vol 36 (3) ◽  
pp. 03F123 ◽  
Author(s):  
Andreas Wucher
Keyword(s):  
Ionization Probability ◽  
Cluster Sims ◽  
Molecular Ionization

Field-assisted ionization theory for microscopists

1994 ◽  
Vol 52 ◽  
pp. 820-821
Author(s):  
Patrick P. Camus
Keyword(s):  
Electric Field ◽  
Electron Tunneling ◽  
Ionization Probability ◽  
Critical Distance ◽  
Tunneling Probability ◽  
Field Ionization ◽  
Radius Of Curvature ◽  
Field Evaporation ◽  
A Value ◽  
Ion Emission

The theory of field ion emission is the study of electron tunneling probability enhanced by the application of a high electric field. At subnanometer distances and kilovolt potentials, the probability of tunneling of electrons increases markedly. Field ionization of gas atoms produce atomic resolution images of the surface of the specimen, while field evaporation of surface atoms sections the specimen. Details of emission theory may be found in monographs.Field ionization (FI) is the phenomena whereby an electric field assists in the ionization of gas atoms via tunneling. The tunneling probability is a maximum at a critical distance above the surface,xc, Fig. 1. Energy is required to ionize the gas atom at xc, I, but at a value reduced by the appliedelectric field, xcFe, while energy is recovered by placing the electron in the specimen, φ. The highest ionization probability occurs for those regions on the specimen that have the highest local electric field. Those atoms which protrude from the average surfacehave the smallest radius of curvature, the highest field and therefore produce the highest ionizationprobability and brightest spots on the imaging screen, Fig. 2. This technique is called field ion microscopy (FIM).

New Design and Development of Size-Selected Gas Cluster SIMS

2009 ◽  
Vol 129 (2) ◽  
pp. 288-293 ◽  
Author(s):  
Kousuke Moritani ◽  
Michihiro Hashinokuchi ◽  
Gen Mukai ◽  
Kozo Mochiji
Keyword(s):  
Design And Development ◽  
Cluster Sims

New approach on molecular ionization by ion impact: the CDW-EIS-SVIM model

2008 ◽  
Vol 41 (22) ◽  
pp. 225201 ◽  
Author(s):  
R F Nascimento ◽  
L E Machado ◽  
C E Bielschowsky ◽  
Ginette Jalbert
Keyword(s):  
New Approach ◽  
Ion Impact ◽  
Molecular Ionization

Molecular Ionization from Carbon Nanotube Paper

2014 ◽  
Vol 126 (23) ◽  
pp. 6046-6050 ◽  
Author(s):  
Rahul Narayanan ◽  
Depanjan Sarkar ◽  
R. Graham Cooks ◽  
Thalappil Pradeep
Keyword(s):  
Carbon Nanotube ◽  
Molecular Ionization
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