Molecular absorption bands of polycyclic aromatic hydrocarbons (PAHs) can be observed in infrared spectra of planetary nebula and dust clouds. The "big-11 feauture" at 11 micrometer in the LWIR is very typical for PAHs combined with silicium carbid (SiC). These molecules carry the IR emission features that dominate the spectra of most galactic and extragalactic sources.
Is somebody in the CN-community able of doing infrared spectroscopy (or astrophotography) at short (1.4-3 microns) or long (8-15 microns) wavelenght? The atmospheric IR window should allow this. Equipment is obviously very expensive (Allied Vision Goldeye camera with an InGaAs-sensor for SWIR starts at 11'000,- Euros; for LWIR even special telescopes with gold-plated mirrors are necessary: PlaneWave offers a 12.5 inch Dall-Kirkham for 14'000,- Euros).