Mass spectrum showing anth²⁺ (C₁₄H₁₀²⁺, m∕z = 89) with one (C₁₄H₁₀²⁺-Ne, m∕z = 99) and two (C₁₄H₁₀²⁺–Ne₂, m∕z = 109) attached neon atoms. Additional mass peaks appearing with Δm∕z = 0.5 can be seen in the spectrum for the bare ion and Ne-dication complexes. They belong to dehydrogenated phen²⁺ (at lower mass) and ¹³C substituted or hydrogenated phen²⁺ (higher masses), respectively, see also van der Burgt et al. (2018). The mass resolution of the second quadrupole mass filter is better than m∕z = 0.5, which allowed us to mass select only the singly tagged target complex to record the IRPD spectra.