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

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 ne/E2 is obtained where ne 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.