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期刊论文

Detailed theoretical and experimental analysis of low-energy electron-N2 scattring

孙卫国Weiguo Sun* Michael A. Morrison William A. Isaacs Wayne K. trail Deab T. Alle R.J.Gulley Michael j. Brennan and Stephen J. Buckman

PHYSICAL REVIEW A 1995, 52 (2): 1229~1256,-0001,():

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摘要/描述

We have carried out a comprehensive theoretical and experimental study of electrom scattering from molecular nitrogen at energies below 10.0eV. In the theoretical component of thisproject we have generated differential and interal cross sections for elastic scattering and vibrational excitation in converged vibrational close-coupling calculations. In the experiments, we have measured differential 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 10eV and, in a complementary time-of-flight experiment, total cross sections at energies between 0.08 and 10.0eV. The measured angular distributins 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-N2 scattering matrix; numerical integration of the resulting extragpolated distributions yields integrated cross sections with almost no error beyond that inherent in themeasured an gular data. We find generally good agreement between the present expermental and theoretical cross section, particularly at energies near the IIg resonance near 2.39eV. In previous studies of scattering in this region, such comparisons have been made problematiocal by the difficulty of ascertaining the appropriate theoretical scattering energy. We recommend here a protocol for resolving this problem for both elastic scattering and vibrational excitation.

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