MEASUREMENT OF CHARGE-EXCHANGE BETWEEN H-2 AND LOW-ENERGY IONS WITH CHARGE STATES 5-LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-80

Charge-exchange cross sections for collisions between H-2 and ions wit h unusually low center-of-mass energies (approximate to 6 eV) and high -charge states (Xe-q+:35,43 less than or equal to q less than or equal to 46,Th-q+:73 less than or similar to q less than or equal to 80) ha ve been measured using a Penning ion trap. A nondestructive measuremen t technique permitted both primary and product ion analysis. The data, averaged over the charge states indicated above, are consistent with a total cross section that scales linearly with ion charge q. The true double-capture cross section is found to be about 25% of the total cr oss section at high q. The results are compared to predictions of the absorbing-sphere model.