Threshold detachment of negative ions by electron impact

Details Threshold detachment of negative ions by electron impact Threshold detachment of negative ions by electron impact

1998-10-24

arxiv.org/abs/physics/9810044v1

Phys. Rev. Lett. 82, 1652 (1999)

Physics

Atomic Physics

4 pages, 4 figures (EPS), to appear in Phys.Rev.Lett, Feb. 22nd, 1999

Scientific paper

10.1103/PhysRevLett.82.1652

The description of threshold fragmentation under long range repulsive forces is presented. The dominant energy dependence near threshold is isolated by decomposing the cross section into a product of a back ground part and a barrier penetration probability resulting from the repulsive Coulomb interaction. This tunneling probability contains the dominant energy variation and it can be calculated analytically based on the same principles as Wannier's description for threshold ionization under attractive forces. Good agreement is found with the available experimental cross sections on detachment by electron impact from $D^{-}$, $O^{-}$ and $B^{-}$.

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