This is the chemical network currently used by the developmental version of Cloudy. The H2 formation rate on grain surfaces is treated according to Cazaux and Tielens (2002), while a complete treatment of the dissociation of H2 due to electron excitation out of X followed by de-excitation into the continuum. Cloudy currently includes the lightest 30 elements of the periodic table, along with the following molecules: H2, H2*, H2+, H3+, HeH+, OH, OH+, CH, CH+, CO, CO+, O2, O2+, CH2, CH2+, CH3+, H2O, H2O+, H3O+, HCOP, SiH2+, SiH HOSi+, SiO, SiO+ This table is formatted such that everything left of the "=>" sign are reactants, while everything to the right are the products. References are inserted into Cloudy, and references for reactions which contain a species that is not hydrogen is given at the end of the reaction. H2 photon => 2H (Solomon process) H H grain => H2 grain H2+ H => H2 H+ H2 H+ => H2+ H H2 H => 3H H2+ photon => H+ H H e => H- photon H- H+ => H2+ e H2+ H- => H2 H H2+ H- => H H H H+ H- => H H+ e H2 H- => H H2 e H- photon => H e H- A+ => H A (Where A is any element on the periodic table from Lithium to Zinc) H- H => H2 e H2 e => H- H H2* e => H- H H- H+ => H H(n=3) H H(n=3) => H- H+ H2(v>=4) e- => H H- H(n=2) H(n=1) => H2 photon H2 e- => H H e H2 H+ => H3+ photon 2H H2 => H2 H2 H2 H2 => 2H H2 H2 photon => H2+ e H2 CRP => H H H2 CRP => H+ H- H2 CRP => H+ H e H3+ H- => H2 H2 H3+ photon => H2+ H H3+ photon => H2 H+ H2 H+ => H2+ H H H2+ => H+ H2 H H3+ => H2 H2+ H3+ H- => H2 H H H2 H3+ => H2 H2+ H H2 H3+ => H2 H+ H2 e H3+ => 3H H+ H => H2+ photon H2+ H+ => H H+ H+ H2+ e => H H+ e- H2+ e => H H H H+ e => H2+ e H2+ photon => H+ H H2 H2+ => H H3+ H2+ H2 => H H+ H2 H3+ hv => H2+ H+ e H2* H2 => H2 H2 H2 H2 => H2* H2 H2* H => H H H H2* H2* => H2 H H He+ H => HeH+ He+ H => He H+ He+ H => He H+ He H- => He H e He+ H2 => He H+ H He H+ => HeH+ H2+ He => HeH+ H HeH+ H => H2+ He HeH+ H2 => H3+ He He+ H- => H He H+ CH => CH+ H+ e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H CH => CH+ H e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2 CH => CH+ H2 e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H+ CH => CH+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 CH e => CH+ 2e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 O CH => CO H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 8 O CH => C OH McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H CH => C H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 OH CH => H2O C McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 C H2 => CH H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H CO => CH O McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 C H2O => CH OH McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 CH2+ e => CH H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 H2 CH2+ => CH H3+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CH+ e => C H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CH+ H => H2 C+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 C+ H2 => H CH+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H3+ C => H2 CH+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CH2+ H => H2 CH+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CH+ H2 => H CH2+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H+ OH => OH+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H+ OH => OH+ H+ e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H OH => OH+ H e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2 OH => OH+ H2 e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2+ OH => OH+ H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 OH e => OH+ 2e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 C+ OH => H CO+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 C OH => CO H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 O OH => O2 H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 OH H => O H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 OH cr => O H Gredel et al. ApJ 347, 289 Table 1 OH H2 => H2O H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 2OH => H2O O McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 O2 H => OH O McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 OH+ H => OH H+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 OH+ H2 => OH H2+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CO H => C OH McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2O e => OH H e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 H2O H => OH H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2O O => OH OH McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2O+ H => H2+ OH McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2O+ H2 => OH H3+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2O+ e => OH H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 H3O+ e => OH 2H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 H3+ OH => H2 H2O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 OH+ H => O H2+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 OH+ H => O+ H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 OH+ e => O H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 OH+ H2 => H H2O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 He+ H2O => H OH+ He McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2O+ H => H2 OH+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 O+ H2 => H OH+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2+ O => H OH+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H3+ O => H2 OH+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 OH+ H2 => O H3+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H+ O2 => H O2+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H O2 => H O2+ e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2+ O2 => O2+ H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 O2 e => O2+ 2e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 O2 H2 => O2+ H2 e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 He+ O2 => O O+ He Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 O2 e => 2O e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 O2 cr => O O Gredel et al. ApJ 347, 289 Table 1 C+ O2 => O CO+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 C+ O2 => CO O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 C O2 => CO O McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 O CO => C O2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 O2+ H => O2 H+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 O2+ e => O O McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 H+ CO => CO+ H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H+ CO => CO+ H+ e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CO H => CO+ H e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 CO H2 => CO+ H2 e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2+ CO => CO+ H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CO e => CO+ 2e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 He+ CO => O C+ He CO e => C O e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 CO photon => C O van Dishoeck, E.F., & Black, J.H., 1988, ApJ, 334, 771 CO photon => C O Hollenbach, D.J., Takahashi, T., & Tielens, A.G.G.M., 1991, ApJ, 377, 192 equation 11 CO photodissociation Hollenbach, D.J., Takahashi, T., & Tielens, A.G.G.M., 1991, ApJ, 377, 192-209 CO photodissociation van Dishoeck, E.F., & Black, J.H., 1988, ApJ, 334, 771 CO+ H => CO H+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CO+ e => C O McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 C+ H2O => H2 CO+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CH2+ O => H CO+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H+ H2O => H2O+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H2O H => H2O+ H e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H2O H2 => H2O+ H2 e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 H+ H2O => H2O+ H+ e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2+ H2O => H2 H2O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2O e => H2O+ 2e McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 He+ H2O => He H2O+ Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H2O+ H => H2O H+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2O+ H2 => H2O H2+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H3O+ H2 => H2O H3+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2+ H2O => H H3O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H3O+ H => H2O H2+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H3O+ e => H2O H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 H3+ H2O => H2 H3O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H2O+ e => O H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 H2O+ H2 => H H3O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 H3O+ H => H2 H2O+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CH2+ e => C H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 C+ H2 => CH2+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 C+ e => C Done internally by Cloudy C photon => C+ Done internally by Cloudy O+ e => O Done internally by Cloudy O photon => O+ Done internally by Cloudy CH H2 => CH2 H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 CH2 H => CH H2 McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 O CH2 => CO 2H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 14 C+ CH2 => CH2+ C Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H+ CH2 => CH+ H2 Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H+ CH2 => CH2+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 C+ CH => CH+ C Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H2* CH => CH2 H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 9 H2* O => OH H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 9 H2* OH => H2O H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 9 H2* O2 => 2OH Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 9 H2* C => CH H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 9 H2* C+ => CH+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 9 C H => CH Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 12 C+ H => CH+ Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 9 OH photon => O H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 CH photon => CH+ e Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 CH photon => C H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 CH+ photon => C+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 CH2+ photon => CH+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 O2 photon => 2O Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 H2O photon => OH H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 HCO+ e => CO H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 C+ H2O => HCO+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 CO+ H2 => HCO+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 HCO+ C => CH+ CO Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 HCO+ CH => CH2+ CO Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 HCO+ OH => H2O+ CO Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 HCO+ H2O => H3O+ CO Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H3O+ C => HCO+ H2 Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H3+ CO => HCO+ H2 Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 O CH => HCO+ e Tielens & Hollenbach 1985, Ap. J. 291, 722 Table8 He+ CH => H C+ He Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 He+ CH2 => H CH+ He Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 He+ CH2 => H2 C+ He Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 He+ H2O => OH H+ He Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 He+ OH => O O+ He Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H3O+ CH => CH2+ H2O Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H3O+ CH2 => CH3+ H2O Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 CH3+ photon => CH2+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 CH3+ photon => CH+ H2 Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 H3+ CH => CH2+ H2 Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 O H2 => OH H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 14 O2 H2 => 2OH Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 14 CH+ O => CO+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 CH3+ e => CH2 H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 CH3+ e => CH 2H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 HCO+ CH2 => CH3+ CO Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 H3+ CH2 => CH3+ H2 Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 CH2+ H2 => CH3+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 CH3+ O => HCO+ H2 Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 Si+ e => Si Done internally by Cloudy SiO photon => Si O Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 5 SiH2+ e => Si 2H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 SiH2+ e => SiH H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 HOSi+ e => SiO H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 HOSi+ e => Si OH Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 7 C+ SiO => Si+ CO Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 C+ SiO => SiO+ C Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 O SiH => SiO H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 8 Si+ H2 => SiH2+ Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 12 SiO+ H2 => HOSi+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 SiH2+ O => HOSi+ H Tielens & Hollenbach 1985, Ap. J. 291, 722 Table 6 Si OH => SiO H McKee & Hollenbach 1989, Ap. J. 342, 306 Table 3 Si+ OH => H SiO+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 Si+ H2O => H HOSi+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 Si+ O2 => O SiO+ McKee & Hollenbach 1989, Ap. J. 342, 306 Table 4 SiO+ e => Si O McKee & Hollenbach 1989, Ap. J. 342, 306 Table 5 CO-H2collision de Jong, T., Chu, S-I., & Dalgarno, A. 1975, ApJ, 199, 69 O-He collision McKee, C.F., Storey, J.W.V., Watson, D.M., & Green, S., 1982, ApJ, 259, 647