Single-electron detachment for Cu⁻, Ag⁻and Au⁻in collision with Ar

Abstract

Single-electron-detachment (SED) cross sections for 5-30 keV Cu − , Ag − and Au − in collision with Ar are measured. The SED cross sections increase as the incident velocity increases. These data are compared with other available experimental data of Li − , Na − , K − , and H − in collision with the same target, argon. The scaling law of n e /E 2 is obtained where n e is the number of the participating electrons for anions and E is the affinity energy of anions. For transition elements, the participating electrons in the electron detachment process are not only from the outmost shell.

Theoretical study for the electron affinities of negative ions with the MCDHF method

“…Negative ions play an important role in a number of areas. The studies of negative ions are very important in electron correlation theory, and are also of great importance in plasma physics, ionosphere physics, astrophysics and flame chemistry [1]. However, the electron affinities of anions count for a lot in the study of anions.…”

MCDHF calculation of electron affinities of Group I and Group IB atomic anions

“…The electron affinity (EA) of an anion counts for a lot in the study of anions. EA plays an important role in a number of research areas, such as in electron correlation theory, and in the scaling model approach which is used in the study of the collision processes of anions [2], as well as in the chemical reaction dynamics. Due to the importance of EA, previous theoretical calculations based on the multi-configuration Dirac-Hartree-Fock method (MCDHF) have been carried out for the electron affinities of anions of the elements of Group III, IV, V, VI and VII [3].…”