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Total cross section measurements for electron scattering from dichloromethane

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Lozano, A. I. and Alvarez, L. and Blanco Ramos, Francisco and Brunger, M. J. and García, G. (2018) Total cross section measurements for electron scattering from dichloromethane. Journal of chemical physics, 149 (24). ISSN 0021-9606

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Official URL: http://dx.doi.org/10.1063/1.5080636




Abstract

Using our magnetically confined electron transmission apparatus, we report the results of total cross sections (TCSs) for electron scattering from dichloromethane (CH2C12). The energy range of this study is 1-300 eV. Wherever possible, the present data are compared to earlier measured TCSs of Wan et al. [J. Chem. Phys. 94, 1865 (1991)] and Karwasz et al. [Phys. Rev. A 59, 1341 (1999)] and to the corresponding theoretical independent atom model with screening corrected additivity rule and interference term (IAM-SCAR+I) results of Krupa et al. [Phys. Rev. A 97, 042702 (2018)] and a spherical complex optical potential formulation calculation of Naghma et al. [J. Electron Spectrosc. Relat. Phenom. 193, 48 (2014)]. Within their respective uncertainties, the present TCS and those of Karwasz et al. are found to be in very good agreement over their common energy range. However, agreement with the results of Wan et al. is quite poor. The importance of the experimentally inherent `missing angle' effect (see later) on the measured TCS is investigated and found to be significant at the lower energies studied. Indeed, when this effect is accounted for, agreement between our measured TCSs and the corrected IAM-SCAR+I+rotations calculation results are, for energies above about 3 eV, in good accord (to better than 8%). Finally, we observe two o-* shape resonances, consistent with the earlier electron transmission spectroscopy results of Burrow et al. [J. Chem. Phys. 77, 2699 (1982)], at about 2.8 eV and 4.4 eV incident electron energy, in our measured TCS. Published by AIP Publishing.


Item Type:Article
Additional Information:

This work was financially supported, in part, by the Spanish Ministerio de Ciencia, Innovación y Universidades (Project No. FIS2016-80440) and the Australia Research Council (Project Nos. DP160102787 and DP180101655). We thank Dr. L. Campbell for his help with some aspects of this study and Professor M. Khakoo for providing us with a preprint of his paper.

Uncontrolled Keywords:Chloromethanes; Transport
Subjects:Sciences > Physics > Nuclear physics
ID Code:55181
Deposited On:28 May 2019 11:30
Last Modified:29 May 2019 08:05

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