Band Effects on Ion-Surface Charge Exchange

1997 ◽  
Vol 11 (06) ◽  
pp. 685-706 ◽  
Author(s):  
Ryutaro Souda
Keyword(s):  
Gas Phase ◽  
Charge Exchange ◽  
Transition Probabilities ◽  
Noble Gas ◽  
Electron Excitation ◽  
Solid Surfaces ◽  
Hydrogen Ion ◽  
Surface Scattering ◽  
New Class ◽  
Low Energy Ions

Various aspects of charge exchange between low-energy ions (10 eV–2 keV) and solid surfaces are discussed with particular emphasis placed on the effects of valence orbital hybridization on the electronic transition probabilities, and uniqueness of surface scattering relative to diatomic gas-phase collision is highlighted. Two classes of projectiles are explored, i.e. inert noble-gas ions and a reactive hydrogen ion. One or two core vacancies are created in noble-gas projectiles during collisions with specific target atoms, leading to (re)ionization and autoionization. In contrast to gas-phase collision, it is found that one-electron excitation predominates over simultaneous two-electron excitation. This result is basically ascribed to the band effect of energy-level crossing. Neutralization of the slow hydrogen ion at a surface is rather unique compared to the noble-gas ions and its probability is sensitively dependent upon ionicity of target atoms or the nature of the valence band. This is because a valence electron is captured via a new class of resonance neutralization which is mediated by a short-lived chemisorption state of hydrogen on a surface.

scholarly journals Super-electrophiles of Tri- and Tetra-Anions Stabilized by Selected Terminal Groups and Their Role in Binding Noble Gas atoms

2021 ◽  
Author(s):  
MingMin Zhong ◽  
Hong Fang ◽  
Deepika Deepika ◽  
Purusottam Jena
Keyword(s):  
Gas Phase ◽  
Noble Gas ◽  
Atomic Clusters ◽  
Weakly Coordinating Anions ◽  
Multiply Charged ◽  
Potential Applications ◽  
Weakly Coordinating

Stabilization of multiply-charged atomic clusters in the gas phase has been a topic of great interest not only because of their potential applications as weakly-coordinating anions, but also for their...

The interaction of atomic particles with solid surfaces at intermediate energies IV. The energy and angular distributions of particles scattered with electric charge from polycrystalline platinum at bombarding energies of 500-5000 eV

1974 ◽  
Vol 341 (1625) ◽  
pp. 213-231 ◽  
Keyword(s):  
Charged Particles ◽  
Solid Surfaces ◽  
Hydrogen Ion ◽  
Angular Distributions ◽  
Sodium Potassium ◽  
Intermediate Energies ◽  
Polycrystalline Platinum ◽  
Composite Spectra ◽  
Energy And Angular Distributions ◽  
Bombarding Energy

The distributions in angle and energy for charged particles emitted from polycrystalline platinum bombarded with ions of hydrogen, sodium, potassium and some hydrocarbons, have been measured, in continuation of previous work (Cawthron, Cotterell & Oliphant 1969 a , b , parts I and II; 1970, part III) to lower energies. Composite spectra are presented, including ions of both signs. The flux of emitted charged particles, under hydrogen ion bombardment, is shown to contain approximately equal numbers of protons and H¯ ions, except at the lowest bombarding energies, where the latter apparently predominate. Scattering in all cases is shown to increase with bombarding energy over the range covered, the increase being near linear for hydrogen and very rapid for alkalimetal ions. In all cases the total emission of charged particles is very small at the lowest bombarding energies employed.

Discovery of a new class of stable gas-phase dianions: Mixed oxygen–carbon cluster OCn2− (n=5–19)

2002 ◽  
Vol 117 (15) ◽  
pp. 7002-7009 ◽  
Author(s):  
Hubert Gnaser ◽  
Andreas Dreuw ◽  
Lorenz S. Cederbaum
Keyword(s):  
Gas Phase ◽  
Carbon Cluster ◽  
New Class

Etching Reactions at Solid Surfaces

1984 ◽  
Vol 38 ◽  
Author(s):  
Harold F. Winters ◽  
J. W. Coburn
Keyword(s):  
Experimental Data ◽  
Conceptual Framework ◽  
Gas Phase ◽  
Ion Bombardment ◽  
Solid Surfaces ◽  
Plasma Environment

AbstractAn understanding of etching reactions in a plasma environment requires a knowledge of: (1) the types of gas phase particles which react at the surface, (2) the etch products formed, and (3) the processes which lead from reactants to products. Experimental data relavant to these topics are reviewed in this paper. A conceptual framework for understanding the etching reaction is reviewed and it is shown that the experimental data presently available is consistent with this framework. The influence of ion bombardment on etching reactions is extensively discussed.

scholarly journals Charge Exchange Cross Sections for Noble Gas Ions and N2 between 0.2 and 5.0 keV

Atoms ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 96
Author(s):  
Steven Bromley ◽  
Corey Ahl ◽  
Chad Sosolik ◽  
Joan Marler
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Neutral Atom ◽  
Mechanical Design ◽  
Noble Gas ◽  
Dominant Role ◽  
Intermediate Energy ◽  
Fundamental Interaction ◽  
Gas Cell ◽  
Astrophysical Plasmas

Charge transfer of an electron from a neutral atom to an ion is a fundamental interaction that plays a dominant role in the energy balance of atmospheric and astrophysical plasmas. The present investigation measured the charge exchange cross sections of noble gas ions (He + , Ne + , Ar + , Kr + ) with N 2 in the intermediate energy range 0.2–5.0 keV. The systems were chosen because there remains a lack of consensus amongst previous measurements and regions where there were no previous measurements. A description of the mechanical design for an electrically floated gas cell is described herein.

Sign in / Sign up

Export Citation Format

Share Document