Sub-components of the 5.7, 7.7, 11.3, 12.7 and 16-18 μm bands exhibit distinct spatial distributions in NGC 7023, indicating at least two different populations of carbonaceous emission carriers.
Title resolution pending
3 Pith papers cite this work. Polarity classification is still indexing.
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PAH charge states peak with cations in the atomic PDR and neutrals in HII and molecular regions, with average sizes of 60-74 carbon atoms, indicating top-down formation near the ionization front and bottom-up in the molecular cloud.
JWST MIRI-MRS data from the Orion Bar PDR show that the 6.2/11.2 micron AIB ratio is the most reliable proxy for PAH ionization fraction while 6.2/8.6 and 7.7/8.6 ratios trace PAH size, with 8.6 and 11.0 microns carried by large compact cations.
citing papers explorer
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PDRs4All XIX. The 6 to 9 $\mu$m region as a probe of PAH charge and size in the Orion Bar
JWST MIRI-MRS data from the Orion Bar PDR show that the 6.2/11.2 micron AIB ratio is the most reliable proxy for PAH ionization fraction while 6.2/8.6 and 7.7/8.6 ratios trace PAH size, with 8.6 and 11.0 microns carried by large compact cations.