Potential curves and symmetries of some resonant states of H<sub>2</sub><sup>-</sup>

Comer, John; Read, F H

doi:10.1088/0022-3700/4/3/009

Cited by 84 publications

(72 citation statements)

References 21 publications

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“…Gulley et al 10 have further examined this proposal in detail. In our case, tests in Ne were carried out before and near the conclusion of the measurements on CH 3 Cl at selected energies and angles, and agreement with the theoretical results of Saha 8 was found to within 3%. The statistical errors in these check were approximately 5-6 %.…”

Section: Methodssupporting

confidence: 71%

“…In particular, the characteristics of the temporary negative ion states of this compound are of importance since they affect the vibrational excitation and dissociative attachment cross sections under electron impact. In an earlier communication, 1 we reported energy loss spectra in CH 3 Cl and CD 3 Cl and relative excitation functions for several vibrational modes of CH 3 Cl that resolved an existing controversy about the locations and symmetries of the temporary negative ion states. In the present work, we present absolute differential cross sections for elastic scattering and excitation of selected vibrational modes over an energy range from approximately 1 to 10 eV.…”

Section: Introductionmentioning

confidence: 64%

“…The electron scattering apparatus employs hemispherical deflectors and is similar in design to those of Comer and Read 3 and Boness and Schulz. 4 The electron optics are scaled to use 1 in diameter electrodes spaced by 1/16 in diameter sapphire balls.…”

Section: Methodsmentioning

confidence: 99%

“…11 A flow rate ratio of approximately 0.077 for CH 3 Cl to He was used to ensure that the mean free paths of both gases at the needle were the same. 7 Energy scale calibrations were carried out using a mixture of N 2 and CH 3 Cl and referring to the resonance peaks in the 2 eV region given by Rohr. 12 The electron energy resolution was typically 28 -30 meV full width at half maximum ͑FWHM͒ as observed in the elastically scattered beam.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, using these data, we have reevaluated the energies and lifetimes of the two lower temporary negative ion states. With these more accurate empirical parameters, the lowest order mixed semiempirical ab initio theory for vibrational excitation of polyatomic molecules given by Gallup 2 is used, for comparison with experiment, to determine the relative strengths for excitation of the vibrational modes of CH 3 Cl at an energy of 3.5 eV, where the two resonances overlap.…”

Section: Introductionmentioning

confidence: 99%

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Low energy electron scattering from CH3Cl

Shi

Chan

Gallup

et al. 1996

The Journal of Chemical Physics

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Differential cross section measurements for the elastic scattering of electrons from CH 3 Cl at energies from 0.5 to 9.5 eV are reported for scattering angles of 30°and 100°. The angular scattering dependence is determined at selected energies over this range. At energies below 1.0 eV, the cross sections are in excellent agreement with calculations using the Born dipole approximation. At large angles and higher energies, the scattering is dominated by a 2 A 1 temporary negative ion state near 3.5 eV. Energy loss data at 3.5, 5.0, and 8.5 eV are reported and the relative contributions of various vibrational modes determined. Differential cross sections for vibrational excitation of the 3 ͑a 1 ͒ C-Cl and 4 (e) CH stretching modes have been measured. The latter reveals a broad shape resonance of 2 E symmetry peaking near 5.5 eV. Angular distributions for excitation of these same modes are also reported. Using fittings to the vibrational excitation functions, the resonance parameters have been extracted and used in a mixed semiempirical ab initio calculation to compute the relative strengths of the vibrational energy loss peaks. These compare favorably with the results of the experiment. Elastic cross sections integrated over angle are reported for low energies. They are substantially larger than the results from recent measurements of the total cross section.

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Section: Methodssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 64%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low energy electron scattering from CH3Cl

Shi

Chan

Gallup

et al. 1996

The Journal of Chemical Physics

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Molecular Dynamics for State‐to‐State Kinetics of Non‐Equilibrium Molecular Plasmas: State of Art and Perspectives

Capitelli

Celiberto

Esposito

et al. 2009

Plasma Processes & Polymers

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The theoretical prediction of molecular plasma features in non‐equilibrium conditions relys on the knowledge of the microscopic collisional dynamics. The state‐to‐state kinetic approach in fact requires complete sets of cross‐sections for the main reaction channels, including their dependence on the internal degrees of freedom. In this paper, the main three classes (electron–molecule, atom–molecule, and gas–surface interaction) of elementary processes have been considered, reviewing old and recent results for hydrogen, oxygen, and nitrogen molecular plasmas. Within each class selected processes have been discussed, summarizing the evidences of theoretical investigation and validating different methods by comparison with available experiments. Future achievements are outlined moving to polyatomic systems, of great interest in many technological plasma‐chemical systems.

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