[en] The electron attachment properties are examined for a number of perfluorinated and chlorocarbon compounds. The experimental technique used was to be a new method developed at JPL. It allowed measurements at high electron energy resolution Δε and at electron energies ε not attainable previously in such experiments

[en] The goal of the work under the contract entitled ''Applications of Molecules as High-Resolution, High-Sensitivity Threshold Electron Detectors'' (DoE IAA No. DE-AI01-83ER13093 Mod. A006) was to explore the electron attachment properties of a variety of molecules at electron energies not accessible by other experimental techniques. As a result of this work, not only was a large body of basic data measured on attachment cross sections and rate constants; but also extensive theoretical calculations were carried out to verify the underlying phenomenon of s-wave attachment. Important outgrowths of this week were also realized in other areas of research. The basic data have applications in fields such as combustion, soot reduction, rocket-exhaust modification, threshold photoelectron spectroscopy, and trace species detection

[en] Several newly observed electron-ion collision phenomena that occur in high temperature plasmas containing electrons and ions of energies 10 to 10₄ eV, or temperature of 10₅ to 10₈K, are reviewed. These are the phenomena of dielectronic recombination, excitation-autoionization, and electron energy-loss scattering as measured in crossed (90⁰) and merged electron-ion beam experiments

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[en] Excitation cross sections have been measured for the optically-forbidden ⁴S^o→²D^o and allowed ⁴S^o→2s2p ⁴P transitions in OII at 3.33 eV and 14.88 eV, respectively. Use was made of the energy-loss, merged-beams method. Cross sections were measured in each transition from threshold to 21.5 eV (²D^o) and 40.0 eV (⁴P). Using close-coupling-calculated differential cross sections data will be corrected for the back-scattered cross section by amounts expected to be less than ∼20%. Comparison will be made to recent close-coupling calculations

[en] Energy-loss spectra for excitation of the ²S → ²P⁰ transitions in ZnII and CdII by electrons have been observed for the first time. Differential scattering cross sections are reported at 75 eV electron energy. Comparisons are made to close-coupling theory for the 4²S → 4²P transition in ZnII. In CdII comparisons are made to the 5²Ssub(1/2) → 5²Psub(3/2) integral cross section from absolute emission measurements, to theoretical results for the analogous ²S → ²p transition in ZnII, and to Gaunt-factor calculations. A description of the crossed beam apparatus is given, and conversion of scattering intensity to absolute cross section discussed. (Auth.)

No abstract available

[en] The results of the first-order many-body theory (FOMBT) are critically compared with several recent experimental studies of e--He and e--H inelastic scattering. The differential and integral cross sections calculated in the FOMBT are compared to the following measurements: differential and integral cross sections for excitation of the 2³S, and the n = 3 manifold of He at energies near 30, 40, and 50 eV; electron--photon coincidence measurements in the 1¹S--2¹P transition in He; and integral cross sections of the 1¹S → 2¹S and 2¹P transitions in the H atom from threshold to 54 eV. Good agreement is found between the results of these measurements and the FOMBT. Where discrepancies exist, their pattern is noted. Where the first-order theory is lacking, several important second-order physical corrections to the first-order theory are indicated. From the above comparisons, the many-body theory results show that the important physical effects in inelastic e-atom scattering are the proper two-time model, the proper use of transition polarization, and the inclusion of the imaginary part of the second-order transition potential

No abstract available

[en] Scattering of electrons by UF₆ molecule was studied at impact energies ranging from 5 to 100 eV and momentum transfer, elastic and inelastic scattering cross sections were determined. The measurements also yielded spectroscopic information which made possible to extend the optical absorption cross sections from 2000 to 435A. It was found that UF₆ is a very strong absorber in the vacuum UV region. No transitions were found to lie below the onset of the optically detected 3.0 eV feature