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. 2017 Mar 9;7:121. doi: 10.1038/s41598-017-00124-9

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© The Author(s) 2017

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Comparison of the ion yield dependence on peak intensity for the ionization of Ho₃N@C₈₀ ^q+ (q = 1, 2) (filled symbols) and C₆₀ ^q+ (q = 1, 2) (open symbols). The Ho₃N@C₈₀ ^q+ results are extracted from data in Fig. 1 and the yields of Ho₃N@C₈₀ with a charge q = 1 is multiplied by 5. The C₆₀ data are from ref. 40 and the C₆₀ ⁺ yield was multiplied by 2 for clarity.