Experimental and theoretical electron-scattering cross-section data for dichloromethane

Abstract

We report on a combination of experimental and theoretical investigations into the elastic differential cross sections (DCS) and integral cross sections (ICS) for electron interactions with dichloromethane, CH 2 Cl 2 , in the incident electron energy over the 7.0-30 eV range. Elastic electron scattering cross section calculations have been performed within the framework of the Schwinger multichannel method implemented with pseudopotentials (SMCPP), and the independent atom model with screening corrected additivity rule including interference effects correction (IAM-SCAR+I). The present elastic DCSs have been found to agree reasonably well with the results of IAM-SCAR+I calculations above 20 eV, and also with the SMC calculations below 30 eV. Although some discrepancies were found for 7 eV, the agreement between the two theoretical methodologies is remarkable as the electron impact energy increases. Calculated elastic DCSs are also reported up to 1000 eV for scattering angles from 0º to 180º together with total cross section (TCS) within the IAM-SCAR+I framework.

Low to intermediate energy elastic electron scattering from dichloromethane (CH2Cl2)

“…At 5eV, the SMC data of Natalense et al [21,22] also agree well with our data. At 10eV, our experimental DCS show very good agreement with both the present MCOP results and the SMCPP data of Krupa et al [24]. Particularly, a shoulder at near 25°and a shallow minimum at near 110°seen in our experimental data are reproduced by both calculations.…”

“…The experimental DCS, ICS, and MTCS for elastic electron scattering by CH 2 Cl 2 obtained in CSUF and UFSCar are listed in tables 1 and 2, respectively. A comparison of the experimental DCS with our theoretical results, calculated at MCOP and IAM levels of approximation, and with the calculated and measured data of Krupa et al [24] is shown in figures 1-3. In the 5-30eV E range, the theoretical results of Natalense et al [21,22] using the SMC approach without the inclusion of polarization effects are also shown.…”

“…The calculated SMC results of Natalense et al [21,22] also agree reasonably with our theoretical and experimental data except at near-forward direction where their calculated data are unable to describe the forwardpeaking behavior of DCS, due to the absence of both permanent and induced dipole effects in their theory. On the other hand, the calculated DCS using the IAM-SCAR method of Krupa et al [24] did not present the shoulder at near 25°a nd also show a pronounced minimum near 115°that is not observed by the experiments. This is not surprising since this model is not expected to work well at low E values.…”

“…In section 3, the theory and details of the UFSCar calculations are presented. In section 4, we present the experimental and theoretical results with comparisons between them and with other results available in the literature [13,21,22,24]. In section 5, we summarize our work with some conclusions.…”

“…Also, TCS, integral elastic cross sections (ICS) and total absorption cross sections (TACS) in the 20-5000eV range were calculated by Naghma et al [23] using the spherical complex optical potential (SCOP) approach. Very recently, theoretical and experimental investigations on elastic electron scattering by CH 2 Cl 2 were reported by Krupa et al [24]. This work reports DCS calculated using two distinct theoretical models: the independent-atom with screen-correcting additivity rule (IAM-SCAR) and the SMCPP.…”