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C60 transient with RFI at 120 and 167 Hz. (a) Simulated transient clipped in negative half. (b) Simulated mass spectrum showing peaks appearing at mixing frequencies of C60 isotopes and RFI signal. (c) Experimental C60 transient obtained by MALDI-FTMS. (d) Experimental mass spectrum obtained by MALDI-FTMS showing the intermodulation peaks.
