Use of Electron Scattering Data to Obtain Accurate Born Cross Sections for Atom-Atom and Other Heavy-Particle Collisions. II. Breakup of FastH2+upon Collision with He

1968 ◽  
Vol 169 (1) ◽  
pp. 37-47 ◽  
Author(s):  
Thomas A. Green ◽  
James M. Peek
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Heavy Particle ◽  
Scattering Data ◽  
Particle Collisions

scholarly journals Thermal Inelastic Collision Processes

1958 ◽  
Vol 8 ◽  
pp. 979-991
Author(s):  
M. J. Seaton
Keyword(s):  
Cross Sections ◽  
Inelastic Collision ◽  
Heavy Particle ◽  
Inelastic Collisions ◽  
Impact Excitation ◽  
Semiempirical Methods ◽  
Particle Collisions ◽  
Exchange Reactions ◽  
Proton Impact ◽  
Collision Processes

Section II contains a summary of relevant collision theory methods. Section III is concerned with heavy particle collisions: excitation of H 1s hyperfine structure (hfs) states by H atom impact; excitation of H2 rotation by H and H2 impact; H 2s→2p transitions produced by proton impact; charge exchange reactions; excitation of atomic levels by proton impact. Section IV deals with inelastic collisions between atoms and electrons. Use of the Born and distorted wave approximations is discussed. Calculations of cross sections for excitation of forbidden lines in pq configurations are reviewed and new results presented for O+2, N+, C+, and Si+, both variational and semiempirical methods being used. In Sec. V, concerned with atomic photoionization, new results are given for photoionization from 2pq configurations.

Energy loss of protons passing through hydrogen

1955 ◽  
Vol 232 (1190) ◽  
pp. 423-434 ◽  
Keyword(s):  
Experimental Data ◽  
Energy Loss ◽  
Total Energy ◽  
Detailed Analysis ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Heavy Particle ◽  
Stopping Power ◽  
Particle Collisions ◽  
Hydrogen Atoms

The cross-sections of processes involving protons and hydrogen atoms calculated by Bates, Dalgarno and Griffing using the Bom approximation are employed to make a detailed analysis of the contributions of excitation, ionization and capture to the stopping power of a gas of atomic hydrogen for a beam consisting initially of protons. A range of beam energies from 10 keV to 3 MeV is covered. The computed total energy loss is compared with experimental data and the accuracy of the Bom approximation for heavy particle collisions is discussed.

scholarly journals B. Collisional Cross Sections

1985 ◽  
Vol 19 (1) ◽  
pp. 148-156
Keyword(s):  
Cross Sections ◽  
Heavy Particle ◽  
Particle Collisions ◽  
Astronomical Research

Because of the magnitude and diversity of material on electron and heavy-particle collisions, I gave references only to published papers of obvious immediate relevance to astronomical research.

scholarly journals Quantitative Theory and Accurate Experiments: Low-energy Electron Scattering by He and H2 as Case Studies

1997 ◽  
Vol 50 (3) ◽  
pp. 473 ◽  
Author(s):  
Robert K. Nesbet
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Vibrational Excitation ◽  
Low Energy ◽  
Energy Electron ◽  
Scattering Data ◽  
Beam Scattering ◽  
Low Energy Electron ◽  
Estimated Error

Accurate low-energy electron scattering data are needed in many fields of physics. However, accurate experiments are difficult to design and to carry out. By 1967 low-energy electron–He cross sections had been measured by two different techniques, designed to provide accurate data. Unfortunately, the data differed by amounts well outside the estimated error bars. Despite the relative simplicity of the He atom, decisive theoretical calculations on the e–He system could not be done with methods available in 1967. After a decade of development of theoretical methodology it became possible in 1979 to carry out calculations with absolute estimates of residual error limits. The results were found to agree closely with the momentum transfer cross section deduced from electron swarm data and with recent beam data by improved techniques, but were inconsistent with the original beam data of 1965. More recently, a similar conflict exists between data measured for electron-impact vibrational excitation of the hydrogen molecule by electron swarm and beam techniques. This conflict has persisted despite great progress in beam scattering techniques and in theoretical methods. A brief review of the relevant electron scattering theory will be given.

scholarly journals Rosetta Mission: Electron Scattering Cross Sections - Data Needs and Coverage in BEAMDB Database

2017 ◽  
Author(s):  
Bratislav P. Marinković ◽  
Jan Hendrik Bredehöft ◽  
Veljko Vujčić ◽  
Darko Jevremović ◽  
Nigel J. Mason
Keyword(s):  
Electron Impact ◽  
Electron Scattering ◽  
Cross Sections ◽  
Molecular Data ◽  
Scattering Data ◽  
Particle Analysis ◽  
Detailed Knowledge ◽  
Molecular Systems ◽  
Rosetta Mission

The emission of [O I] lines in the coma of Comet 67P/Churyumov-Gerasimenko during the Rosetta mission have been explained by electron impact dissociation of water rather than the process of photodissociation. This is the direct evidence for the role of electron induced processing has been seen on such a body. Analysis of other emission features is handicapped by a lack of detailed knowledge of electron impact cross sections which highlights the need for a broad range of electron scattering data from the molecular systems detected on the comet. In this paper we present an overview of the needs for electron scattering data relevant for the understanding of observations in coma, the tenuous atmosphere and on the surface of 67P/Churyumov-Gerasimenko during the Rosetta mission. The relevant observations for elucidating the role of electrons come from optical spectra, particle analysis using the ion and electron sensors and mass spectrometry measurements. To model these processes electron impact data should be collated and reviewed in an electron scattering database and an example is given in the BEAMD, which is a part of a larger consortium of Virtual Atomic and Molecular Data Centre – VAMDC.

scholarly journals Rosetta Mission: Electron Scattering Cross Sections—Data Needs and Coverage in BEAMDB Database

2017 ◽  
Author(s):  
Bratislav P. Marinković ◽  
Jan Hendrik Bredehöft ◽  
Veljko Vujčić ◽  
Darko Jevremović ◽  
Nigel J. Mason
Keyword(s):  
Electron Impact ◽  
Electron Scattering ◽  
Cross Sections ◽  
Molecular Data ◽  
Scattering Data ◽  
Particle Analysis ◽  
Detailed Knowledge ◽  
Molecular Systems ◽  
Rosetta Mission

The emission of [O I] lines in the coma of Comet 67P/Churyumov-Gerasimenko during the Rosetta mission have been explained by electron impact dissociation of water rather than the process of photodissociation. This is the direct evidence for the role of electron induced processing has been seen on such a body. Analysis of other emission features is handicapped by a lack of detailed knowledge of electron impact cross sections which highlights the need for a broad range of electron scattering data from the molecular systems detected on the comet. In this paper we present an overview of the needs for electron scattering data relevant for the understanding of observations in coma, the tenuous atmosphere and on the surface of 67P/Churyumov-Gerasimenko during the Rosetta mission. The relevant observations for elucidating the role of electrons come from optical spectra, particle analysis using the ion and electron sensors and mass spectrometry measurements. To model these processes electron impact data should be collated and reviewed in an electron scattering database and an example is given in the BEAMD, which is a part of a larger consortium of Virtual Atomic and Molecular Data Centre – VAMDC.

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