Der Ramsauereffekt im Argon

Ramsauer-Townsend minimum in methane — modified effective range analysis

“…The R-T minimum occurs in heavier atomic gases, where the scattering potential is strong enough to induce a π (modulo π) phase-shift in the s-partial wave at low impact energies, where contributions from other partial waves are still small. It was shown previously in pioneering work for argon [3] that including an empirical polarization potential is necessary to reproduce theoretically the R-T minimum. The sub-eV electron energies are important for tokomak edge regions, radiation counters and electrical discharges [4,5], with the R-T minimum determining electron temperatures in plasmas [6].…”

Elastic scattering of electrons from Xe,Cs+, andBa2+Johnson1, Guet2 1994Phys. Rev. A638220View full textAdd to dashboardCite

“…Although low-energy scattering of electrons from closed-shell atoms has been a subject for experimental [1 -3] and theoretical [4,5] investigation for more than 60 years, relatively little work has been done on the related problem of low-energy elastic scattering from ions. A characteristic feature of low-energy scattering of electrons from noble-gas atoms is the existence of a sharp minimum in the cross section at electron energies ( 1 eV; the Ramsauer-Townsend minimum. This feature of the cross section is a manifestation of the polarization of the atomic core by the scattered electron; to account for it theoretically, one must include effects of electron correlation.…”

Charge Distributions of Krypton Ions Following Photo-Ionization in theMShell

“…EXPERIMENTAL Apparatus and method have previously been described in detail. 4 low pressures by x rays from various targets. Ions formed in the source volume of the spectrometer were extracted by a small electric field, accelerated toward a magnetic analyzer, and detected by a dynode structure.…”