Inelastic collisions at low energies

1969 ◽  
Vol 47 (10) ◽  
pp. 1723-1729 ◽  
Author(s):  
A. Dalgarno
Keyword(s):  
Energy Loss ◽  
Cross Sections ◽  
Low Energy ◽  
Inelastic Collisions ◽  
Low Energies ◽  
Low Energy Electrons ◽  
The Cross ◽  
Loss Rates

A summary is presented of the processes by which low energy electrons lose energy in moving through the atmosphere and estimates are given of the cross sections and energy loss rates. The mechanisms by which thermal electrons cool are described and the cooling efficiencies are listed.

Inelastic collisions between ions and atoms

1952 ◽  
Vol 212 (1109) ◽  
pp. 235-248 ◽  
Keyword(s):  
Excited States ◽  
Cross Section ◽  
Cross Sections ◽  
Negative Ions ◽  
Inelastic Collisions ◽  
Electron Affinities ◽  
Atomic Collision ◽  
Low Energies ◽  
Low Energy Electron ◽  
The Cross

Charge-exchange cross-sections for H + , D + , O + 2 , H + 2 , O + , CO + and N + 2 in A; D + , O + and N + in Kr; D + , C + and Br + in Xe, and O + in H 2 O have been measured between 25 and 4000 eV energy by a method previously described. The normal atomic collision cross-sections rise to a maximum at a voltage which depends on the value of Δ E √ M for the process, M being the atomic mass and Δ E the energy defect of the reaction. Collisions between negative ions and atoms have been studied with the same apparatus, the cross-section of the detachment reaction X - + Y → X + e + Y — Δ E being obtained. For S - , Br - , I - , C - , P - , Li - in Ne, and H - in He, Ne, A, Kr, Xe, this rises with increasing energy of the incident ion. For O - in He, Ne, A, Kr, Xe, Cl - in He, Ne, A, Kr, Xe, and F - in Ne, Kr, Xe the cross-section at low energies is unexpectedly large for the value of Δ E √M. This may be interpreted as being due to the presence of excited states of these ions, of low electron affinities, in the beam. With O - , a low energy electron bombardment source gave smaller cross-sections, i.e. a smaller proportion of excited ions.

Surface Boundary Effect in Electron-Solid Interactions

2007 ◽  
Vol 121-123 ◽  
pp. 1175-1180 ◽  
Author(s):  
Khanam Salma ◽  
Z.J. Ding
Keyword(s):  
Energy Loss ◽  
Cross Sections ◽  
Solid Surface ◽  
Surface Effect ◽  
Boundary Effect ◽  
Surface Boundary ◽  
Self Energy ◽  
Quantum Mechanical Treatment ◽  
Planar Surfaces ◽  
Low Energy Electrons

Electrons impinging or escaping from a solid surface undergo surface electronic excitations which are competitive in nature to other electron-solid interaction channels. The detailed information about electron inelastic scattering probability for surface excitations at solid surface is also important in reflection electron energy loss spectroscopy. A self energy formalism based on quantum mechanical treatment of interaction of electrons with a semi-infinite medium, which uses the optical dielectric function is considered to study surface boundary effect for planar surfaces of Cu and Ni for various conditions of electron-solid interactions. The total surface excitation probability of an electron while crossing the surface boundary once is numerically computed by integrating surface term of spatial and angular dependent differential inelastic cross sections over energy loss and distance from the surface. It is found that surface effect is prominent for low energy electrons and large oblique angles with respect to surface normal and confined to the close vicinity of surface boundary.

Differential and integral cross sections for elastic scattering of low-energy electrons by O2

1995 ◽  
Vol 28 (18) ◽  
pp. 4141-4148 ◽  
Author(s):  
G Woste ◽  
C J Noble ◽  
K Higgins ◽  
P G Burke ◽  
M J Brunger ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Low Energy ◽  
Low Energy Electrons

Importance of coupling for inelastic collisions between protons and hydrogen atoms

1965 ◽  
Vol 283 (1392) ◽  
pp. 100-114 ◽  
Keyword(s):  
Cross Sections ◽  
Intermediate State ◽  
Relative Velocity ◽  
Inelastic Collisions ◽  
Hydrogen Atoms ◽  
Resonance Reactions ◽  
The Cross ◽  
Good Agreement

The importance of coupling for fast collisions between protons and hydrogen atoms is examined with the two-centred expansion in atomic eigenfunctions proposed by Bates (1958 a ). Cross-sections are evaluated for reactions H + + H (I s ) → H(I s ) + H + , H + + H( I s ) → H(2 s ) + H + , and H + + H(l a ) → H + + H(2 s ). The effect of a single intermediate state, either I s or 2 s , is considered. For the non-resonance processes, it is found that the cross-sections may be substantially increased by passage through intermediate state for incident energies less than about 10 keV, tending towards equality with decrease in relative velocity. Results obtained for the symmetrical resonance reactions are in good agreement with the two-state solutions of McCarroll (1961).

HgCl B2Σ+1/2 formation by low-energy electron impact dissociation of HgCl2 and(or) CH3HgCl molecules: applications to HgCl (B → X) laser

1990 ◽  
Vol 68 (2) ◽  
pp. 166-169 ◽  
Author(s):  
Mohammad F. Mahmood
Keyword(s):  
Energy Range ◽  
Electron Energy ◽  
Cross Sections ◽  
Band System ◽  
Low Energy ◽  
Dissociative Excitation ◽  
Intense Band ◽  
Electron Impact Dissociation ◽  
Low Energy Electrons ◽  
Low Energy Electron

An investigation was made of the process of dissociative excitation of a HgCl radical in the B2Σ+1/2 state due to collisions of low-energy electrons with HgCl2 and CH3HgCl molecules. Using the most intense band of the B2Σ+1/2 – X2Σ+1/2 system of the HgCl radical at 557 nm that corresponds to the ν′ = 0 to ν″ = 22 transition, emission cross sections were measured in the electron energy range 1–100 eV. The threshold electron energy for the observation of the B2Σ+1/2 – X2Σ+1/2 band system has been determined to be 7.0 and 8.0 eV for HgCl2 and CH3HgCl molecules, respectively.

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