Abstract
Formation of H(2s) atoms in charge exchange collisions of protons with Cs, Rb, K and Na atoms has been studied for the proton energy E ranging from 0.2 keV to 4.0 keV. The metastable atom fractions f 2s of neutral hydrogen H 0 beams produced under single-collision condition, which is regarded as the ratio of `total' cross section for the charge exchange reactions eventually leading to formation of H(2s) atoms to total charge exchange cross section, have been determined as a function of E . All of the f 2s ( E ) curves obtained exhibit a marked structure, and the f 2s ( E ) values vary between 0.18 and 0.38 with an average value of about 0.25 in this energy range. In the case of Cs target, the dependence of the yield of H(2s) atoms as well as the fraction f 2s on the target atom thickness in units of atoms/cm 2 has also been examined.
Published Version
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