Can thermodynamic equilibrium be established in planet-forming disks?

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Table 3

Number of various types of reactions taken from the STAND network.

Type of reactions	Number of reactions	Comments
A + B + M → AB + M	50	Termolecular
AB + M → A + B + M	48	Thermal decomposition
A⁺ + B + M → AB⁺ + M	5	Ion-termolecular
AB⁺ + M → A⁺ + B + M	5	Ion-thermal decomposition
A + B → C + D	332	Neutral-neutral bimolecular
C + D → A + B	235	reverse neutral-neutral bimolecular
A⁺ + B → C⁺ + D	549	Ion-neutral bimolecular
C⁺ + D → A⁺ + B	463	Reverse ion-neutral bimolecular
A⁺ + e⁻ + M → A + M	46	3-Body recombination
A + M → A⁺ + e⁻ + M	46	Thermal ionization
A⁺ + e⁻ → A + hν	5	Radiative association
AB⁺ + e⁻ → A + B	107	Dissociative recombination

Notes. A, B and C denote gas-phase species whereas M represents the third-body. The total number of these reactions are 1891 which is consistent with the sum of reactions added and overwritten by the STAND (1155 + 736).

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