Fig. 2. (a) Arrival time distributions for the ions at m/z 256.15 (n = 7) and 263.16 (n = 8). The relative abundances of M_n and C_n between the two cases illustrate the occurrence of an odd-even effect. The asterisk labels a trace of the open form of M₇ (top) or M₈ (bottom). (b) Isotope patterns of the ion-mobility-separated parent ions C₇ and M₇ with peak spacings of Δm/z = 0.25 and 0.5 in line with the assigned charge states.