Kreckel H, Motsch M, Mikosch J, Glosík J, Plasil R, Altevogt S, Andrianarijaona V, Buhr H, Hoffmann J, Lammich L, Lestinsky M, Nevo I, Novotny S, Orlov D A, Pedersen H B, Sprenger F, Terekhov A S, Toker J, Wester R, Gerlich D, Schwalm D, Wolf A, Zajfman D
Max-Planck-Institut für Kernphysik, Heidelberg, Germany.
Phys Rev Lett. 2005 Dec 31;95(26):263201. doi: 10.1103/PhysRevLett.95.263201. Epub 2005 Dec 20.
The energy-resolved rate coefficient for the dissociative recombination (DR) of H(3)(+) with slow electrons has been measured by the storage-ring method using an ion beam produced from a radiofrequency multipole ion trap, employing buffer-gas cooling at 13 K. The electron energy spread of the merged-beams measurement is reduced to 500 microeV by using a cryogenic GaAs photocathode. This and a previous cold- measurement jointly confirm the capability of ion storage rings, with suitable ion sources, to store and investigate H(3)(+) in the two lowest, (J,G) = (1,1) and (1,0) rotational states prevailing also in cold interstellar matter. The use of para-H(2) in the ion source, expected to enhance para-H(3)(+) in the stored ion beam, is found to increase the DR rate coefficient at meV electron energies.
