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$\begingroup$ There's no upper limit to the energy at which neutral hydrogen would be unlikely to absorb a photon? $\endgroup$
– Rich McDaniel
Commented Dec 21, 2022 at 18:42
$\begingroup$ @RichMcDaniel pdg.lbl.gov/2019/reviews/…. see section 33.4.4 You got photoelectric effect, Compton scattering, and finally, pair-production. $\endgroup$
– JEB
Commented Dec 21, 2022 at 20:04

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