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Publications

Low-energy elastic electron scattering from chloromethane.

C. Navarro 1, A. Sakaamini 1, J. Cross 1, L. R. Hargreaves 1, M.A. Khakoo 1, Kamil Fedus 2, C. Winstead 3, V. McKoy 3

1. Department of Physics, California State University, Fullerton, CA 92831, USA 2. Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland 3. A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA

http://dx.doi.org/10.1088/0953-4075/48/19/195202

 Abstract. We report theoretical as well as (normalized) experimental differential and integral cross sections for vibrationally elastic scattering of low-energy electrons from chloromethane, CH3Cl, also known as methyl chloride. The theoretical cross sections were computed using the Schwinger multichannel variational method in the single-channel approximation, with polarization effects included via virtual excitations. Cross section measurements were made at incident energies ranging from 0.5 to 100 eV and at scattering angles from 5 to 125 degrees. We compare our data to earlier previous results for this molecule.

Low-energy elastic electron scattering from chloroethane.

A. Sakaamini 1, C. Navarro 1, J. Cross 1, L. R. Hargreaves 1,
M.A. Khakoo 1, Kamil Fedus 2, C. Winstead 3, V. McKoy 3

1. Department of Physics, California State University, Fullerton, CA 92831, USA 2. Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland 3. A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA

http://dx.doi.org/10.1088/0953-4075/48/20/205202

Abstract. We report theoretical as well as (normalized) experimental differential and integral cross sections for vibrationally elastic scattering of low-energy electrons from chloroethane, also known as ethyl chloride. The theoretical cross sections were computed using the Schwinger multichannel variational method in the single-channel approximation, with polarization effects included via virtual excitations. Cross section measurements were made at incident energies ranging from 1 to 30 eV and at scattering angles from 10 to 125 degrees. We compare our data to earlier previous results for this molecule and for the related molecule chloromethane.

Low-energy elastic electron scattering from ethylene: Elastic scattering and vibrational excitation.

M. A. Khakoo 1, S. M. Khakoo 2, A. Sakaamini 1, B. A. Hlousek 1, L. R. Hargreaves 1, J. Lee 3, and R. Murase 3

1.Department of Physics, California State University, Fullerton, California 92831, USA.
2.Department of Chemistry & Biochemistry, California State University, Fullerton, California 92831, USA.
3.Troy High School, 2200 Dorothy Lane, Fullerton, California 92831, USA

http://dx.doi.org/10.1103/PhysRevA.93.012710

Abstract. Normalized experimental differential and integral cross sections for elastic and vibrationally inelastic scattering of low-energy electrons from ethylene (C2H4) have been measured over a large number of incident electron energies and angles. The differential cross sections are measured at incident energies from 0.5 to 100 eV and scattering angles from 5◦ to 130◦. These measurements are made to monitor the role of the 2B2g (≈1.8eV) and the higher 2B2u + 2B1u + 2Ag (≈7.5 eV) resonances in the scattering dynamics. Our differential cross section measurements are in very good to excellent agreement with past measurements, and in reasonable agreement with theory as regards forward scattering. A feature in the elastic cross section at 90◦ scattering angle at ≈3.5 eV is tentatively associated with the onset of excitation of the ∼a 3B1u triplet electronic state. Differential cross sections for vibrational excitation of four composite energy features in ethylene are also presented from incident energies of 1.25–15 eV. These results are compared to previous measurements with satisfactory results regarding resonant behavior of these features also concerning the role of the 2B2g(≈1.8eV) and the higher 2B2u+2B1u+2Ag (≈7.5 eV) resonances in the scattering dynamics.

 

Elastic scattering of low-energy electrons from Toluene.

Ahmad Sakaamini 1, L. R. Hargreaves 1, M. A. Khakoo 1, D. F. Pastega 2, and M. H. F. Bettega 2

1.Department of Physics, California State University, Fullerton, California 92831, USA
2.Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990 Curitiba, Paraná, Brazil

http://dx.doi.org/10.1103/PhysRevA.93.042704

Abstract. Theoretical and normalized experimental differential, momentum transfer, and integral cross sections for vibrationally elastic scattering of low-energy electrons from toluene (C6H5CH3) are presented. The differential cross sections are measured at incident energies from 1 to 20 eV and scattering angles from 15° to 130°. The calculated cross sections are obtained using the Schwinger multichannel method with pseudopotentials in the static-exchange plus polarization approximation. Comparisons are made between the present theory and measurements with earlier available measurements. In general, the agreement between the theory and the experiment is very good. We also discuss the resonance spectra of toluene, where we find three π* shape resonances whose locations agree well with the experiment. In addition, we compare the cross sections of toluene and benzene, since the former can be considered as a benzene derivative by the substitution of a hydrogen in benzene by a CH3 group in toluene.

 

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