Collisions of H- ions and fast H0 atoms in a Cs vapor target

The charge-changing cross sections sigma/sub -/0 and sigma/sub -x/ sigma/sub -/+ have been measured for 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/sub -/0 = 1.80 x 10-15 cm2 and sigma/sub -/+ = 1.30 x 10-16 cm2. The cross sections sigma/sub g/ and sigma/sub g/ have been measured for fast H(1s) 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/sub g/ = 5.58 x 10-16 cm2 and sigma/sub g/ = 3.75 x 10-18 cm2. Also measured are the equilibrium fractions and the maximum neutral fraction when H- is incident on a Cs vapor target with energy in the range 30--200 keV. The maximum neutral fraction when H- is incident on Cs is 0.58 for energies in the range 100--200 keV