High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

Abstract

Absolute total cross sections for electron scattering from Ar and Xe at electron energies ranging from 7 meV to 20 eV were obtained with the experimental technique employing the threshold-photoelectron source. The measured total cross sections are in good agreement with those obtained by other groups down to 100 meV, above which several experimental works have been reported. Scattering lengths for electron scattering from Ar, Kr, and Xe were determined from the present total cross sections and our recent results for Kr using the modified effective range theory. The values of the scattering length obtained in the present analysis differ from the values determined from the previous swarm experiments and beam experiments. The resonant structures in the total cross sections due to Feshbach resonances of Ar, Kr, and Xe with an improved energy resolution were also measured. Analyses of the resonant structure were carried out based on the spin-dependent resonant scattering theory in order to determine the values of the natural width of Feshbach resonances of Ar, Kr, and Xe precisely.

All-order relativistic many-body theory of low-energy electron-atom scattering

“…Indirect effects include a target wave function that is different due to relativistic effects. There have been a number of experimental determinations of the elastic cross section [34,50,[56][57][58][59][60][61][62] and the momentum transfer cross section [63][64][65][66][67]. Of the many calculations of the electron-krypton system [56,[68][69][70][71][72], the BSR calculation [42,72] is the most complete ab initio calculation.…”

Markov Chain Monte Carlo Effective Range Analysis of Low-Energy Electron Elastic Scattering from Xenon

“…The grey area in the plot (clearly visible only near R-T minimum) corresponds to 50 % credibility region due to uncertainties of MERT parameters. The fit is compared with experimental data by: Guskov et al [25], Dababneh et al [26], Jost et al [27], Nickiel et al [28], Subramanian et al [29], Alle et al [31], Szmytkowski et al [32], and Kurokawa et al [14,15] are smaller than for Kr (see extensive review of scattering cross-sections in ref. [24]).…”

“…For present analysis, only those experimental TCSs were chosen that extend well below the energy corresponding to the R-T minimum: Guskov et al [25], Jost et al [27], Ferch et al [30], Alle et al [31], and Szmytkowski et al [32]. The most recent experimental data of Kurokawa et al [14,15] has not been included in the analysis because these cross-sections are much lower in low energy limit than other experiments (see Fig. 1).…”

“…To the best of our knowledge, only O'Malley [11], Guskov et al [12], Weyhreter et al [13], and Kurokawa et al [14,15] used the original approach to MERT in order to extrapolate some low-energy e − −Xe experimental data down to zero energy. However, except the last paper, these analysis were done long time ago, when few datasets were available.…”

Control of atomic dynamics in laser-assisted electron-atom scattering through the driving-laser ellipticity

“…1(a) are approximately constant (except near n ≈ 25), for Ar the corresponding oscillatory maxima first decrease and then rise sharply as n increases. The RT effect consists in a nonmonotonic energy dependence of dσ el /d for low-energy electron scattering by multielectron atoms and ions due to an interplay of partial scattering amplitudes with different l. For field-free e-Ar scattering, the RT effect leads to a minimum in the DCS ("RT minimum"), whose position (E ≈ E R ) depends on the scattering angle θ and is in the region E R 1 eV [for the total (angle-integrated) cross section, E R ≈ 0.3 eV [29]]. Since the RT effect does not exist for e-Ne scattering, for which only the s-wave phase shift δ 0 (E) dominates at small energies, the aforementioned difference between results for Ar and Ne originates from the RT effect in the DCS dσ el [P(t c ),P n (t c )]/d P n (t c ) for e-Ar scattering, in which case the energy E(t c ) (which equals zero for n = 0) passes through the RT minimum with increasing n.…”