Table 1: Overview over the major heating and cooling processes in PDR physics.
Heating Cooling

photoelectric heating (dust & PAH) [CII] 158 $\mu$ m

collisional de-excitation of vib. excited H₂ [OI] 63, 145 $\mu$ m

H₂ dissociation [CI] 370, 610 $\mu$ m

H₂ formation [SiII] 35 $\mu$ m

CR ionization CO, H₂O, OH, H₂

gas-grain collisions Ly $\alpha$ , [OI], [FeII]

dissipation of turbulence gas-grain collisions

**Table 1:** Overview over the major heating and cooling processes in PDR physics.
Heating	Cooling
photoelectric heating (dust & PAH)	[CII] 158 $\mu$ m
collisional de-excitation of vib. excited H₂	[OI] 63, 145 $\mu$ m
H₂ dissociation	[CI] 370, 610 $\mu$ m
H₂ formation	[SiII] 35 $\mu$ m
CR ionization	CO, H₂O, OH, H₂
gas-grain collisions	Ly $\alpha$ , [OI], [FeII]
dissipation of turbulence	gas-grain collisions

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