3-2 Dielectronic Recombination of Be-like 40Ar14+at the CSRm

The total recombination rate coefficients of Be-like 40Ar14+ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP.Fig.1 shows the recombination spectrum for electron energy from 0 to 58 eV in the center-of-mass frame.The resonant capture,involving the core excitation of an electron and two electrons,which is termed dielectronic recombination(DR)and trielectronic recombination(TR)individually and leads to series of peaks,have been preliminarily identified by extending downward in energy from their series limits with the Rydberg formula[1].