Appreciable quantities of molecular hydrogen ions have been observed in backscattering of 5-keV D3+ from Au. At a scattering angle of 10° the D+2/D+1 ratio was 5×10−2 and D+3/D+1=2×10−4. The ratios decrease with increasing scattering angle, but D+2 is observable at angles up to 50°.
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Eckstein et al. (1975) studied this question.