IRMPD spectra of (A) perylene^•+, (B) peropyrene^•+, (C) ovalene^•+ , and (D) isoviolanthrene^•+ plotted together with scaled computed spectra (stick diagrams) that have been convolved with a Gaussian line profile with a FWHM of 30 cm⁻¹ to facilitate comparison. The gray line in the spectrum of iso^•+ indicates a spectrum measured at reduced FELIX exposure to avoid saturation and thereby attempting to better resolve the vibrational modes.