Calculations of ionization rate-constants for the field-ion microscope

1992 ◽  
Vol 277 (3) ◽  
pp. 359-369 ◽  
Author(s):  
S.C. Lam ◽  
R.J. Needs
Keyword(s):  
Rate Constants ◽  
Ionization Rate ◽  
Field Ion Microscope

scholarly journals Tunneling Calculation in the Field Ion Microscope

2020 ◽  
Vol 12 ◽  
pp. 5-10
Author(s):  
Ariel Almeida Abreu Silva ◽  
A.V. Andrade-Neto
Keyword(s):  
Rate Constants ◽  
Ionization Probability ◽  
Ionization Rate ◽  
Model Potential ◽  
Inert Gas ◽  
Dimensional Model ◽  
Ionization Zone ◽  
One Dimensional ◽  
Barrier Penetration ◽  
Field Ion Microscope

In this work we describe calculations of tunneling rate constants for the Field Ion Microscope (FIM) using one-dimensional model potential that simulates the ionization process in a FIM. We obtain expressions for the ionization rate constant (ionization probability per unit of time) of inert gas atoms as a function of their position above the surface. In order to calculate the probability of barrier penetration we have used the semiclassical (JWKB) approximation. We have also calculated ionization zone widths as the distance between points where ionization rate is a maximum and half of this value. An application to helium as the imaging gas is presented to highlight the power of the method.

Ionization Rate Constants of Alkali Metals in CO Flames

1963 ◽  
Vol 39 (10) ◽  
pp. 2558-2564 ◽  
Author(s):  
Tj. Hollander ◽  
P. J. Kalff ◽  
C. T. J. Alkemade
Keyword(s):  
Rate Constants ◽  
Alkali Metals ◽  
Ionization Rate

Two-photon excitation of atomic oxygen at 200.6, 192.5, and 194.2 nm: Absolute cross sections and collisional ionization rate constants

1988 ◽  
Vol 37 (9) ◽  
pp. 3259-3269 ◽  
Author(s):  
Douglas J. Bamford ◽  
Roberta P. Saxon ◽  
Leonard E. Jusinski ◽  
Jesse D. Buck ◽  
William K. Bischel
Keyword(s):  
Cross Sections ◽  
Rate Constants ◽  
Atomic Oxygen ◽  
Ionization Rate ◽  
Two Photon ◽  
Photon Excitation ◽  
Collisional Ionization ◽  
Two Photon Excitation

scholarly journals Theoretical chemical ionization rate constants of the concurrent reactions of hydronium ions (H3 O+ ) and oxygen ions (O 2+) with selected organic iodides

2019 ◽  
Vol 54 (5) ◽  
pp. 422-428
Author(s):  
Rafal  S. Strekowski ◽  
Coralie Alvarez ◽  
Jeanne Petrov-Stojanović ◽  
Denis Hagebaum-Reignier ◽  
Henri Wortham
Keyword(s):  
Rate Constants ◽  
Chemical Ionization ◽  
Ionization Rate ◽  
Oxygen Ions ◽  
Hydronium Ions

Field-Ion Microscopy of BCC Metals: A Study of Image Differences and Topographical Variations

1973 ◽  
Vol 31 ◽  
pp. 114-115
Author(s):  
O. T. Inal ◽  
L. E. Murr
Keyword(s):  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Surface Atom ◽  
Image Brightness ◽  
Field Ion Microscopy ◽  
Topographic Features ◽  
Bcc Metals ◽  
Electron Orbital ◽  
Ion Microscopy ◽  
Field Ion Microscope

When sharp metal filaments of W, Fe, Nb or Ta are observed in the field-ion microscope (FIM), their appearance is differentiated primarily by variations in regional brightness. This regional brightness, particularly prominent at liquid nitrogen temperature has been attributed in the main to chemical specificity which manifests itself in a paricular array of surface-atom electron-orbital configurations.Recently, anomalous image brightness and streaks in both fcc and bee materials observed in the FIM have been shown to be the result of surface asperities and related topographic features which arise by the unsystematic etching of the emission-tip end forms.

Sign in / Sign up

Export Citation Format

Share Document