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Mass spectra of D-Ribose as obtained by (a) 70 eV EI and (b) FI. This is an example showing the simultaneous formation of M+• and [M+H]+ ions by FI. Note: To preserve the character of the original figure the peak labels have not been corrected to become M+• and the abscissas are still labeled m/e rather than dimensionless m/z. Reproduced from Ref. [12] by kind permission. © Springer Nature, Heidelberg, 1965.
