Elastic scattering of electrons from chloroform

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Hlousek, B. A. ; Martin, M. F. ; Khakoo, M. A. ; Zawadzki, M. ; Moreira, G. M. ; Maioli, L. S. ; Bettega, M. H. F. ; Machado, L. E. ; da Mata, V. A. S. ; da Silva, A. J. ; Iga, I. ; Lee, M-T ; Homem, M. G. P.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW A; v. 100, n. 5, p. 12-pg., 2019-11-26.

Resumo

We present experimental and theoretical cross sections for elastic electron scattering from CHCl3. This is an important target because of its relevance to environmental chemistry and the plasma etching industry as a source of chlorine radicals. The experimental results were obtained at incident electron energies ranging from 0.5 to 800 eV in the 10 degrees-130 degrees scattering angle range. Theoretically, the scattering cross sections in the low-energy region were obtained by using the Schwinger multichannel method with pseudopotentials in the static-exchange plus polarization approximation. Additionally, in the low- and intermediate-energy ranges, theoretical calculations were also performed using a molecular complex optical potential and a single-center expansion method combined with Pade approximation. Further calculations using the independent atom model were also made at intermediate energies. Momentum-transfer cross sections were derived by integrating the differential cross sections. In general, there is a good agreement between the experimental data and the theoretical results. Moreover, the calculations reveal the presence of three shape resonances in the elastic channel, located at 0.5, 2, and 8 eV. The two higher-lying resonances were confirmed by the present experiments, whereas the positions of the two lower-lying resonances agree well with previous results of electron attachment experiments. (AU)

• Processo FAPESP: 15/08258-2 - Seções de choque para a interação de elétrons com moléculas orgânicas voláteis
• Beneficiário: Manoel Gustavo Petrucelli Homem
• Modalidade de apoio: Auxílio à Pesquisa - Regular