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.
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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.