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.
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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: XVIII. The evolution of the PAH ionisation and PAH size distribution across the Orion Bar
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.
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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.