Collisions ofH−ions and fastH0atoms in a Cs vapor target

Abstract

The charge-changing cross sections ${\sigma }_{-0\mathrm{}}$ and ${\sigma }_{-+}$ have been measured for ${\mathrm{H}}^{-}$ ions incident on a Cs vapor target with energies in the range 30-200 keV. When the incident ion has an energy of 100 keV, ${\sigma }_{-0\mathrm{}}=1.80\mathrm{}\times {10}^{-15\mathrm{}}$ ${\mathrm{cm}}^2$ and ${\sigma }_{-+}=1.30\mathrm{}\times {10}^{-16\mathrm{}}$ ${\mathrm{cm}}^2$. The cross sections ${\sigma }_{g+}$ and ${\sigma }_{g-}$ have been measured for fast H(ls) atoms incident on a Cs target with energies in the range 30-200 keV. When the incident atom has an energy of 100 keV, ${\sigma }_{g+}=5.58\mathrm{}\times {10}^{-16\mathrm{}}$ ${\mathrm{cm}}^2$ and ${\sigma }_{g-}=3.75\mathrm{}\times {10}^{-18\mathrm{}}$ ${\mathrm{cm}}^2$. Also measured are the equilibrium fractions and the maximum neutral fraction when ${\mathrm{H}}^{-}$ is incident on a Cs vapor target with energy in the range 30-200 keV. The maximum neutral fraction when ${\mathrm{H}}^{-}$ is incident on Cs is 0.58 for energies in the range 100-200 keV.