diffuse interstellar bands (DIBs)
Identifying the carriers of DIBs has become one of the classic astrophysical spectroscopic problems. Recent work suggests they are caused by polycyclic aromatic hydrocarbons (PAHs), or, most likely, their cations, since PAH ions of all sizes absorb in the visible and near infrared, and such molecules are expected to be ionized by the intense ultraviolet field present in much of the interstellar medium.
Related category• SPECTRA AND SPECTROSCOPY
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