A storage ring study of dissociative excitation and recombination of D3+

Dissociative recombination and excitation of D-3(+) have been studied in CRYRING, a heavy-ion storage ring at the Manne Siegbahn Laboratory at Stockholm University. The measured cross section for dissociative recombination was used to deduce a 300 K rate constant of 2.7 x 10(-8) cm(3) s(-1). This is a factor of four smaller than the corresponding value for H-3(+) measured earlier in CRYRING. Dissociative excitation into both the D and 2D channels (D + D or D-2) were studied. The 2D channel occurs at energies below threshold for the ion's dissociative states, which indicates that resonant enhanced dissociative excitation via autoionizing resonances takes place. No measurable effect could be observed for the dissociative recombination cross sections when an electric field of 30 V/cm was applied to the electron-ion interaction region.