Angular distribution of electrons elastically scattered from gases: 1.5-400 eV on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>. II

Shyn, T. W.; Carignan, G. R.

doi:10.1103/physreva.22.923

Cited by 120 publications

(90 citation statements)

References 32 publications

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“…It has been done by measuring the elastic differential cross section in nitrogen and comparing this curve with the absolute values. 19 The background contribution to the signal has been estimated by recording three vibrational electron energy loss spectra at 3, 7, and 11 eV impact energies, respectively, at the scattering angle chosen for the measurement of the vibrational excitation function.…”

Section: Methodsmentioning

confidence: 99%

Electronic and vibrational excitation of acrylonitrile by low and intermediate energy electrons

Motte‐Tollet

Messina

Hubin‐Franskin

1995

The Journal of Chemical Physics

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Electronic and vibrational excitation of acrylonitrile induced by 3-50 eV energy electrons has been investigated by the electron energy loss spectroscopy. Electronic excitation spectra have been recorded for 30 and 50 eV impact energies at a 10°scattering angle in the energy loss range from 5.5 to 11.5 eV, corresponding to the excitation of electrons belonging to the outermost-valence-shell molecular orbitals. We have reviewed the assignment of the valence excited states occurring in the 5.5-9 eV energy loss region. The vibrational patterns associated with the two lowest-energy singlet valence excited states have also been re-examined. Moreover, we have proceeded for the first time to the analysis and attribution of several Rydberg series converging to the ionic ground state and to its two lowest-energy electronic excited states. The study of the excitation function of the C-H stretching modes of acrylonitrile in the 3-11 eV electron impact energy range has shown evidence of a broad shape resonance built on the electronic ground state of the molecule and centered at 5.85 eV. This resonance contributes to a preferential excitation of the C-H stretching modes suggesting that the charge distribution of the additional electron is very likely that of a *͑C-H͒ valence molecular orbital. A comparison has been made between the resonances observed in C 2 H 4 and CH 2 CHCN, in order to discuss the symmetry of the resonant state and also to analyze the substitution effect of the cyanogen group.

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Section: Methodsmentioning

confidence: 99%

Electronic and vibrational excitation of acrylonitrile by low and intermediate energy electrons

Motte‐Tollet

Messina

Hubin‐Franskin

1995

The Journal of Chemical Physics

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“…Absolute DCSs for either 0~0 or 0~1 scattering have been measured by Ehrhardt and Willmann [38], Srivastava, Chutjian, and Trajmar [41], Shyn and Carignan [45], Tanaka, Yamamo-to, and Okada [47], Brunger et al. [56], Brennan et al.…”

Section: Intrqductiqnmentioning

confidence: 99%

Detailed theoretical and experimental analysis of low-energy electron-N2scattering

et al. 1995

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We have carried out a comprehensive theoretical and experimental study of electron scattering from molecular nitrogen at energies below 10.0 eV. In the theoretical component of this project we have generated differential and integral cross sections for elastic scattering and vibrational excitation in converged vibrational close-coupling calculations. In the experiments, we have measured dift'erential cross sections for these processes at scattering angles from 20' to 130 in a crossed-beam experiment at a large number of energies between 0.55 and 10 eV and, in a complementary time-of-Right experiment, total cross sections at energies between 0.08 and 10.0 eV. The measured angular distributions have been extrapolated to 0 and 180 using a procedure based on a nonlinear least-squares fit constrained by known physical properties of the e-Nz scattering matrix; numerical integration of the resulting extrapolated distributions yields integrated cross sections with almost no error beyond that inherent in the measured angular data. We find generally good agreement between the present experimental and theoretical cross section, particularly at energies near the H~r esonance near 2.39 eV. In previous studies of scattering in this region, such comparisons have been made problematical by the difhculty of ascertaining the appropriate theoretical scattering energy. We recommend here a protocol for resolving this problem for both elastic scattering and vibrational excitation.PACS number(s): 34.80.6s

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“…For air, however, one relies on the momentum transfer cross sections of N 2 and O 2 , where the data, experimental and calculated exists (Ali 1984) for electron energies from 001 to 1000 eV. For example, the most recent measured cross section in N 2 (Shyn & Carignan 1980) for electron energies from 1-5 to 400 eV is in good agreement with the most recent theoretical calculation of Jain et al (1984), and they are in good agreement with the other measurements (Cartwright 1978;Englehardt et al 1964;Shyn et al 1972;Srivastava et al 1976). For details confer Ali (1982) and figure 4.…”

Section: The Collision Frequency For Momentum Transfermentioning

confidence: 99%

Nanosecond air breakdown parameters for electron and microwave beam propagation

Ali

1988

Laser Part. Beams

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Air breakdown by avalanche ionization plays an important role in the electron beam and microwave propagations. For high electric fields and short pulse applications one needs avalanche ionization parameters for modeling and scaling of experimental devices. However, the breakdown parameters, i.e., the ionization frequency vs E/p (volt. cm" 1 . Torr" 1 ) in air is uncertain for very high values of E/P. We review the experimental data for the electron drift velocity, the Townsend ionization coefficient in N 2 and O 2 and develop the ionization frequency and the collision frequency for momentum transfer in air. We construct the E/p vs Pr diagram and show that our results are in better agreement with the most recent short pulse air breakdown experiments, compared to those predicted by the expression of Felsenthal & Proud (1965).

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Angular distribution of electrons elastically scattered from gases: 1.5-400 eV onN2. II

Cited by 120 publications

References 32 publications

Electronic and vibrational excitation of acrylonitrile by low and intermediate energy electrons

Electronic and vibrational excitation of acrylonitrile by low and intermediate energy electrons

Detailed theoretical and experimental analysis of low-energy electron-N2scattering

Nanosecond air breakdown parameters for electron and microwave beam propagation

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