The analytic characterizations of electron impact cross sections for important atmospheric gases (namely, O2, N2, O, CO, CO2, and He) are updated. With these cross sections it is simple to communicate massive quantities of experimental and theoretical results. In addition, these forms are convenient for applications in energy degradation calculations, including a new approach described in a companion paper.

Electron impact on atmospheric gases, I. Updated cross sections

The conditions of electron-impact excitation in flowing oxygen downstream from a discharge are reinterpreted. It is shown that total oxygen mass flow is not conserved as the discharge is turned on and off, even though the inlet flow rate remains constant. The total amount of gas is diminished when the discharge is turned on, apparently due to collection of atomic oxygen by the system walls. A revised total cross section is reported for the excitation of 1304-A radiation.

Electron‐impact excitation of the 3S0 and 5S0 states of atomic oxygen

The role of cascading in auroral or photoelectron excited atomic oxygen emission is investigated by calculating distorted wave electron impact cross sections for some 24 excited levels in O I. Cascading contributes approximately 75 percent of the effective emission cross section for 1304 A and 1356 A. About 98 percent of the cascade component to these ultraviolet lines is fed through the respective 8446- and 7774-A transitions, with the consequence that the 4368- and 3947-A emissions are very weak. The cascade component to 1304 A is strongly enhanced in an optically thick medium due to radiation trapping of the lines from the 3s' 3D, nd/sup 3/D, and ns/sup 3/S (n greater than or equal to 4) levels to the ground state. The 1304-A emission cross section appropriate in the optically thick atmosphere is predicted to be a factor of 2 larger than the emission cross section measured in an optically thin laboratory experiment. Consideration of this effect is necessary to understand the measured atmospheric 1304-/1356-A ratio in terms of laboratory cross sections. Several recent atmospheric measurements on electron excited atomic oxygen 1304-, 1356-, 4368-, 7774-, and 1152-A lines appear to be consistent with calculated results, which imply that the Stonemore » and Zipf (1974) 1304- and 1356-A laboratory cross sections may be systematically too large by as much as a factor of 2.« less

Cascade and radiation trapping effects on atmospheric atomic oxygen emission excited by electron impact

This paper demonstrates that there is an inconsistency between ionospheric measurements of the photoelectron flux and the solar EUV flux. The problem which occurs for EUV wavelengths near 250 A or photoelectron energies near 35 eV has serious implications for theoretical photoelectron flux calculations and could help to explain up to 40 percent of the difference between calculated and measured photoelectron fluxes for electron energies below 35 eV. It is also shown that: (1) only photons with wavelengths shorter than 310 A are of importance in producing photoelectrons; (2) above 20 eV, the photoelectron flux is controlled by the production of primary photoelectrons, while below 20 eV the flux is controlled by degraded photoelectrons; (3) the calculated cascading production rate is insensitive to the cross sections used for the calculation; and (4) the photoelectron flux is inversely proportional to the total inelastic cross sections.

An investigation of the consistency of the ionospheric measurements of the photoelectron flux and solar EUV flux

: A revised and updated annotated bibliography on atomic transition probabilities covering the literature from 1914 through October 1977 is presented It contains approximately 2400 references and is divided into four main sections, with each article assigned a number The first section contains a listing, by number, of articles of general interest The second section lists by number all articles containing numerical data; it is arranged by element and stage of ionization and is further subdivided according to theoretical and experimental methods, comments, and compilations The third section contains a listing of all articles, including number, authors, title, and journal reference; it is arranged by year of publication and alphabetically by authors names within the year All foreign language papers are identified, and their titles are translated into English The final section contains a listing of all authors and the numbers of the papers they have authored or co-authored

Bibliography on Atomic Transition Probabilities: 1914 Through October 1977

Distorted-Wave Calculation of Electron-Impact Excitation of Atomic Oxygen

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Distorted-Wave Calculation of Electron-Impact Excitation of Atomic Oxygen