Figure 23.

LIFDI mass spectrum of N-hexylpyridinium tetrafluoroborate in methanol at a concentration of 0.1 µl ml⁻¹ scanned over the m/z 50–800 range. The insets show the [C₂A]⁺ and [C₃A₂]⁺ cluster ions for comparison of the experimental and calculated isotopic patterns. Reproduced from Ref. [139] with kind permission. © American Chemical Society, 2007.