Rate coefficients for dissociative attachment and resonant electron-impact dissociation involving vibrationally excited O2 molecules

2014 ◽  
Author(s):  
V. Laporta ◽  
R. Celiberto ◽  
J. Tennyson
Keyword(s):  
Electron Impact ◽  
Rate Coefficients ◽  
Dissociative Attachment ◽  
Vibrationally Excited ◽  
Electron Impact Dissociation ◽  
Resonant Electron

scholarly journals Electron-Impact Dissociation of Vibrationally-Excited Molecular Hydrogen into Neutral Fragments

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 75 ◽  
Author(s):  
Liam Scarlett ◽  
Jeremy Savage ◽  
Dmitry Fursa ◽  
Mark Zammit ◽  
Igor Bray
Keyword(s):  
Coordinate System ◽  
Electron Impact ◽  
Cross Sections ◽  
Vibrational Level ◽  
Molecular Hydrogen ◽  
Vibrationally Excited ◽  
Close Coupling ◽  
Spherical Coordinate ◽  
Electron Impact Dissociation ◽  
D 72

We present convergent close-coupling (CCC) calculations of electron-impact dissociation of vibrationally-excited molecular hydrogen into neutral fragments. This work follows from our previous results for dissociation of molecular hydrogen in the ground vibrational level [Scarlett et al., Eur. Phys. J. D 72, 34 (2018)], which were obtained from calculations performed in a spherical coordinate system. The present calculations, performed utilizing a spheroidal formulation of the molecular CCC method, reproduce the previous dissociation cross sections for the ground vibrational level, while allowing the extension to scattering on excited levels.

scholarly journals Rate coefficients for electron-impact dissociation of O3+ to singly charged fragments

2021 ◽  
pp. 110-110
Author(s):  
Dragoljub Belic ◽  
Mirjana Vojnovic ◽  
Miroslav Ristic ◽  
Xavier Urbain ◽  
Pierre Defrance
Keyword(s):  
Energy Distribution ◽  
Electron Impact ◽  
Cross Section ◽  
Distribution Functions ◽  
Rate Coefficients ◽  
Cross Section Data ◽  
Thermal Electron ◽  
Section Data ◽  
Electron Impact Dissociation ◽  
Energy Distribution Functions

Rate coefficients for electron-impact dissociation of O3+ to the O+ and O2+ fragments are calculated for the new, recommended cross section data set and for various collisional conditions. Two sets of the cross section data, measured recently by different experimental groups, are used. These cross sections differ significantly with each other, but are renormalized and optimized to the coherent data base. Rate coefficients for the ozone cation fragmentation are determined using the Maxwellian and the non-thermal electron energy distribution functions (EEDF). In the case of Maxwellian distribution, mean electron energies cover the range from zero up to 2 keV. Non-thermal electron energy distribution functions are adopted from the recent electron observations by the 3-D plasma and energetic particles experiment on the WIND spacecraft. The non-thermal rates are evaluated for the mean electron energies from 4 to 80 eV. The role of the possible contribution of electron-impact dissociation of O3+ to the Ozone layer depletion has been emphasized.

scholarly journals Rate coefficients for electron-impact dissociation of O3+ to singly charged fragments

2021 ◽  
pp. 110-110
Author(s):  
Dragoljub Belic ◽  
Mirjana Vojnovic ◽  
Miroslav Ristic ◽  
Xavier Urbain ◽  
Pierre Defrance
Keyword(s):  
Energy Distribution ◽  
Electron Impact ◽  
Cross Section ◽  
Distribution Functions ◽  
Rate Coefficients ◽  
Cross Section Data ◽  
Thermal Electron ◽  
Section Data ◽  
Electron Impact Dissociation ◽  
Energy Distribution Functions

Rate coefficients for electron-impact dissociation of O3+ to the O+ and O2+ fragments are calculated for the new, recommended cross section data set and for various collisional conditions. Two sets of the cross section data, measured recently by different experimental groups, are used. These cross sections differ significantly with each other, but are renormalized and optimized to the coherent data base. Rate coefficients for the ozone cation fragmentation are determined using the Maxwellian and the non-thermal electron energy distribution functions (EEDF). In the case of Maxwellian distribution, mean electron energies cover the range from zero up to 2 keV. Non-thermal electron energy distribution functions are adopted from the recent electron observations by the 3-D plasma and energetic particles experiment on the WIND spacecraft. The non-thermal rates are evaluated for the mean electron energies from 4 to 80 eV. The role of the possible contribution of electron-impact dissociation of O3+ to the Ozone layer depletion has been emphasized.

Electron impact excitation of Al XIII : Collision strengths and rate coefficients

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-309-Pr2-312
Author(s):  
K. M. Aggarwal ◽  
F. P. Keenan ◽  
S. J. Rose
Keyword(s):  
Electron Impact ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation

Electron-impact dissociation ofCD3+andCH3+ions producingCD2+,CH+, andC+fragment ions

2009 ◽  
Vol 79 (5) ◽  
Author(s):  
E. M. Bahati ◽  
M. Fogle ◽  
C. R. Vane ◽  
M. E. Bannister ◽  
R. D. Thomas ◽  
...  
Keyword(s):  
Electron Impact ◽  
Electron Impact Dissociation ◽  
Fragment Ions

Rate coefficients for electron impact excitation of N2

2015 ◽  
Vol 463 ◽  
pp. 38-46 ◽  
Author(s):  
M. Vojnović ◽  
M. Popović ◽  
M.M. Ristić ◽  
M.D. Vićić ◽  
G.B. Poparić
Keyword(s):  
Electron Impact ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation

scholarly journals Subauroral red arcs as a conjugate phenomenon: comparison of OV1-10 satellite data with numerical calculations

1997 ◽  
Vol 15 (8) ◽  
pp. 984-998 ◽  
Author(s):  
A. V. Pavlov
Keyword(s):  
Electron Density ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Atomic Oxygen ◽  
Major Ions ◽  
Integral Intensity ◽  
Rate Coefficients ◽  
Vibrationally Excited ◽  
Vibrational Distribution ◽  
Vibrational Levels

Abstract. This study compares the OV1-10 satellite measurements of the integral airglow intensities at 630 nm in the SAR arc regions observed in the northern and southern hemisphere as a conjugate phenomenon, with the model results obtained using the time-dependent one-dimensional mathematical model of the Earth ionosphere and plasmasphere (the IZMIRAN model) during the geomagnetic storm of the period 15–17 February 1967. The major enhancements to the IZMIRAN model developed in this study are the inclusion of He+ ions (three major ions: O+, H+, and He+, and three ion temperatures), the updated photochemistry and energy balance equations for ions and electrons, the diffusion of NO+ and O2+ ions and O(1D) and the revised electron cooling rates arising from their collisions with unexcited N2, O2 molecules and N2 molecules at the first vibrational level. The updated model includes the option to use the models of the Boltzmann or non-Boltzmann distributions of vibrationally excited molecular nitrogen. Deviations from the Boltzmann distribution for the first five vibrational levels of N2 were calculated. The calculated distribution is highly non-Boltzmann at vibrational levels v > 2 and leads to a decrease in the calculated electron density and integral intensity at 630 nm in the northern and southern hemispheres in comparison with the electron density and integral intensity calculated using the Boltzmann vibrational distribution of N2. It is found that the intensity at 630 nm is very sensitive to the oxygen number densities. Good agreement between the modelled and measured intensities is obtained provided that at all altitudes of the southern hemisphere a reduction of about factor 1.35 in MSIS-86 atomic oxygen densities is included in the IZMIRAN model with the non-Boltzmann vibrational distribution of N2. The effect of using of the O(1D) diffusion results in the decrease of 4–6% in the calculated integral intensity of the northern hemisphere and 7–13% in the calculated integral intensity of the southern hemisphere. It is found that the modelled intensities of the southern hemisphere are more sensitive to the assumed values of the rate coefficients of O+(4S) ions with the vibrationally excited nitrogen molecules and quenching of O+(2D) by atomic oxygen than the modelled intensities of the northern hemisphere.

Sign in / Sign up

Export Citation Format

Share Document