Single-Electron Detachment Cross Sections for Transition-Element Negative Ions Ti^-, Cr^-, Cu^- in Collision with N2

Single-electron detachment (SED) cross sections for Cr^- and Ti^- in collision with N2 have been obtained in the energy region of 10-30keV, for the first time to our knowledge. In the present energy range, the magnitude of the Cr^-+N2 and Fe^-+N2 SED cross sections is larger than that of Cu^-+N2. It is also found that the cross sections for Cr^- and Ti^- in collisions with N2 exhibit different dependences on anion impact velocity from that of Cu^-.