Photodissociation Region ·
Edge of Starlight
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seel
.com · FUV-lit neutral slab · Orion Bar
FUV field
G₀ ~ 10⁴
Depth
A_V 0
Layer
—
Ionization front (H II)
FUV photons (6–13.6 eV)
H→H₂ / C⁺→C→CO
[C II] 158 μm cooling
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.com · Photodissociation Regions: Layered Chemistry at the Edge of Starlight