Scattering of electrons from argon atoms

Differential cross sections for elastic electron scattering in argon over the angular range 130°–180°

“…2(a), 3(a), and 4(a) and are included in Table I. Figures 2(b), 3(b), and 4(b) compare the results of Gibson et al [9], the most recent measurements performed in the angular region 15°-130°and our results of the 130°-180°region with the results of various theoretical calculations in argon [12][13][14][15][16][17]20] which have been chosen for comparison from a number of theoretical works [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. They represent various theoretical approaches used in the calculations.…”

“…Our measurements at selected scattering angles below 130°also agree well with the existing differential cross sections. The cross sections of Srivas- [15]; -, Saha [17]; -·-, Sienkiewicz and Baylis [20]; -··-, McEachran and Stauffer [14]; -· -, Dasgupta and Bhatia [12]; ---, Bell et al [16].…”

“…These works differ most significantly in their various approaches to account for long-range polarization and short-range correlation interactions in the electron scattering process, in the low energy range; they did use similar and commonly accepted ways to describe static and exchange interactions. The polarizedorbital method has been used by Thompson [10] and Garbaty and LaBahn [11] and recently by Dasgupta and Bhatia [12] to calculate elastic differential and total cross sections. McEachran and Stauffer [13] presented differential and integral cross sections calculated within their polarized-orbital method in an adiabatic exchange approximation that included a dipole polarization potential and treated exchange exactly.…”

Simulation of sheath dynamics and current nonuniformity in plasma-immersion ion implantation of a patterned surface

“…Thus, we allow for elastic Ar ϩ -Ar collisions ͑mean free path length ϭ11 cm) and Ar ϩ -Ar charge exchange collisions ( ϭ10 cm). 30,31 Our cell width is 0.1 mm and the time step is 1 ns.…”

Measurements of differential cross sections in the backscattering region

“…5a, recent DCSs of Mielewska et al (2004) for elastic electron scattering measured above 1301 at 10 eV are compared with other available experimental and theoretical results. The theoretical calculations include the adiabatic exchange approximation of McEachran and Stauffer (1983) which take into account dipole polarization and exchange treated exactly, the R-matrix calculations of Fon et al (1983) and Bell et al (1984), the multiconfigurational self-consistentfield method of Saha (1991), which includes dynamical polarization and electron correlation effects, the polarizedorbital method of Dasgupta and Bhatia (1985) and the relativistic calculations of McEachran and Stauffer (1997) and Sienkiewicz and Baylis (1987). The experimental data of Furst et al (1989) and Gibson et al (1996) agree well with each other, particularly in the range from 151 to 1101.…”