Upper panel: Full scan mass spectrum of PnP 31 with IS-CID recorded using the standard Thermo LTQ mass spectrometer. Lower panel: 1D MS for PnP 31 derived from data acquired using the modified 2D MS/MS instrument with IS-CID and application of a supplementary SWIFT broadband activation waveform. Dotted lines connect peaks for precursor ions that are observed in both spectra.
