H/sup-/formation from collision-induced dissociation of H/sub 3//sup+/in He at keV energies

Abstract:

We have used a small accelerator with a colutron-type ion source and a computer-controlled rotating chamber housing a parallel plate energy analyzer to measure the angular and energy distributions of the negative ions produced by the collision-induced dissociation of H/sub 3//sup +/ in He. Due to the correlation between center-of-mass energy distributions of the dissociating fragments and their angular spread in the laboratory frame we have used the results from both measurements to estimate the internal energy increment of the system (E) and the energy at which the fragments are ejected as a result of the dissociation (W). The total energy E /approx equal/ 22 eV is consistent with the calculated energy from the H/sub 3//sup +/ ground state to the dissociation limit leading H/sup -/. (orig.).

Año de publicación:

1989

Keywords:

Fuente:

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