Fig. 2: Room-temperature absorption cross-sections in hexane.

(Top) quinoline (blue/solid), isoquinoline (red/dashed), (Middle) quinazoline (blue/solid), quinoxaline (red/dashed), (Bottom) 1,6-naphthyridine (blue/solid), 1,8-naphthyridine (red/dashed). Data were obtained using a simple Beer–Lambert law analysis (see section “Methods”). The vertical dashed lines indicate the central 267 nm pump wavelength used in our TAS measurements. No additional spectral features appear in the range 390–800 nm.