论文信息 - Electron collisions with 4He2+ at the TSR

Electron collisions with 4He2+ at the TSR

The dissociative recombination (DR) of 4He2+ has been investigated at the heavy-ion storage ring TSR in Heidelberg. Rate coefficients were measured up to collision energies of 40 eV. Vibrational level populations were monitored using the Coulomb explosion imaging technique showing relaxation to the v = 0 level (>95%) through collisions with cold electrons within 50s. Low-energy DR rate coefficients are derived for v = 0, 1 and ≥2 which show a strong v-dependence. A low-energy super-elastic collision (SEC) rate coefficient of αv = 1→0SEC (Ed = 0)≈1.8×10−7cm3s−1 was found.

[1] S. Novotny,et al. Inelastic electron collisions of the isotopically symmetric helium dimer ion He-4(2)+ in a storage ring , 2008 .

[2] A. Orel,et al. Resonant dissociative excitation and vibrational excitation of He{sub 2}{sup +} , 2007 .

[3] E. Staicu-Casagrande,et al. Dissociative recombination and low-energy inelastic electron collisions of the helium dimer ion , 2004, physics/0412144.

[4] L. V. Søgaard,et al. Storage ring study of the dissociative recombination of He+2 , 2005 .

[5] M. Larsson,et al. Absolute high-resolution rate coefficients for dissociative recombination of electrons with HD+: Comparison of results from three heavy-ion storage rings , 2003 .

[6] A. Orel,et al. Dissociative recombination of He 2 + molecular ions , 1999 .

[7] Z. Vager,et al. Coulomb explosion imaging at the heavy ion storage ring TSR , 1998 .

[8] Wolf,et al. High-resolution measurement of dielectronic recombination of lithiumlike Cu26+ , 1992, Physical review. A, Atomic, molecular, and optical physics.

[9] R. Stokstad,et al. First experiments with the heidelberg test storage ring TSR , 1989 .