Elastic and total cross sections for electron-carbon disulfide collisions

Abstract

In this work, we report on a theoretical study of electron-CS2 collision in the low- and intermediate-energy range. More specifically, the elastic differential and integral cross sections as well as the grand total (elastic+inelastic) cross sections in the 0.05-100 eV range are reported. A complex optical potential consisting of static, exchange, correlation-polarization plus absorption contributions, derived from a fully molecular wavefunction, is used for the electron-molecule interaction. The Schwinger variational iterative method combined with the distorted-wave approximation are applied to calculate the scattering amplitudes. The comparison between the calculated results and the existing experimental and theoretical results is encouraging.

A comprehensive and comparative study of elastic electron scattering from OCS and CS2 in the energy region from 1.2 to 200 eV

“…At 1.5 eV we see, as noted above, excellent agreement between the present experimental cross section and that of Sohn et al 27 The SVIM calculation of Lee et al 41 provides a good overall description of the shape of the DCS but it is generally higher in magnitude, with the exception of the most forward angles we see good agreement between this calculation and the data of Sohn et al 27 Perhaps not surprisingly, the IAM-SCAR calculation does not predict the DCS well at this energy, with a completely different angular dependence and magnitude at low angles. However, above about 100 • , this theory is in relatively good accord with experiment.…”

“…Our Q e agrees well with the previous result of Sohn et al 27 below 5 eV, but no other experimental data are available for comparison from 8 to 200 eV. Six theoretical approaches are available for comparison, those of Lynch et al, 31 Lee et al, 41 Bettega et al, 42,43 Gianturco and Stoecklin, 44 and Raj and Tomar, 30 as well as the present IAM-SCAR calculation. The calculation of Raj and Tomar 30 (only above 100 eV) considerably overestimates the experimental measurement.…”

“…Finally, at an energy of 100 eV ( Figure 5(d)), the minimum at around 60 • has almost disappeared while that at 120 • is now quite deep, with the overall measured cross section occupying more than two orders of magnitude in scale. At this energy we can compare with four calculated cross sections and again, all provide an excellent agreement at smaller scattering angles, with the best overall agreement being found with the IAM-SCAR approach, although the SVIM cross section of Lee et al 41 and the IAM TABLE I. Differential (10 −16 cm 2 /sr) and integral cross sections (10 −16 cm 2 ) for elastic scattering from the OCS molecule.…”

“…Figure 4 shows the overall behavior of the elastic differential cross sections for CS 2 at energies between 1.5 and 200 eV. The present calculated results (IAM-SCAR and CMS) are also presented and compared, as are the Schwinger variational calculations of Lee et al, 41 the SMC results of Bettega et al, 42,43 the results from the calculation of Gianturco and Stoecklin 44 and the IAM calculations of Raj and Tomar. 30 We also compare with the other available experimental results, those of Sohn et al 27 and Allan.…”

“…Szmytkowski (E 0 = 1-100 eV) 40 performed a two-centre, parametric optical potential calculation for differential, integral elastic, and momentum transfer cross sections. Raj and Tomar (E 0 = 100-1000 eV) 30 have employed the IAM, while Lee et al (E 0 = 0.04-100 eV) 41 have made use of the Schwinger variational iterative (SVIM) method using the distorted-wave approximation. Schwinger multichannel (SMC) calculation results at both the static exchange (SE) and static exchange plus polarization (SEP) levels have also been reported by Bettega et al,42,43 with a further computation from Gianturco and Stoecklin 44 also being noted.…”