Fig. 1
Quinoline (C9H7N, 129 amu) and pentacene (C22H14, 278 amu). Because of the nitrogen atom, protonated quinoline and its hydrogenated states are easily generated in the electrospray ionization source. Pentacene is solid at room temperature and the radical cation, as well as cationic de- and hydrogenated states, were produced by a Nielsen plasma ion source.
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