Left: Models of the PAH-C₆₀ bis-adducts after geometry optimization for the PAHs 2H-indene (2InC₆₀, a-c), indenyl (2IylC₆₀, d-g), anthracene (2AnC₆₀, h), and tetracene (2TnC₆₀, i). In the case that the bis-adduct has different configurations (isomers), the most stable structure is highlighted with a red asterisk. Right: The theoretical IR spectra corresponding to the bis-adducts structures a-i presented in the left panel. In all panels, the red dashed spectra correspond to the mono-adduct analogous, while the blue dashed lines mark the four strongest C₆₀ features (~7.0, 8.5, 17.4 and 18.9 μm). Note that the convolution parameters are the same as in Figures 4 and 5.