H + C2H (+M) -> C2H2 (+M)

k_inf = 1.00E+17/T cm3/mol s

F_cent = (1-0.646) exp(-T/132) + 0.646 exp(-T/1315) + exp(-5566/T)

Third-body efficiencies:

N2                    1.0 
H2     Enhanced by    2.0 
H2O    Enhanced by    6.0 
CH4    Enhanced by    2.0 
CO     Enhanced by    1.5 
CO2    Enhanced by    2.0 
C2H6   Enhanced by    3.0 
AR     Enhanced by    0.7 

SOURCE:

RRKM calculations with an estimated k_inf.
The k_inf is an estimate from H + methyl and ethyl recombination values at 1000 K. A 1/T dependence was assumed.
k_o and F_cent for N2 are calculated by the method of Troe (1977):
delta-E(0 K) = 0.0 kcal/mol
delta-H(0 K) = -131.6 kcal/mol
< delta E> = 0.24 kcal/mol
The Lennard-Jones parameters: sigma (C2H2-N2) = 3.92 A, epsilon = 129 K
I+/I = 7.3 (for Waage-Rabinovitch correction)
v = 3374, 3282, 1974, 730, 730, 611, 611 cm^(-1)

COMMENTS:

Tsang and Hampson (1986) estimate a value 1.8 times higher at 1000 K.

Comparison to decomposition data, k_o in Ar (cm3/mol s)

T/K	GRI-Mech	Frank and Just (1980)	Sidhu et al. (1992)
2000	7.0E4	8.3E4
3000	6.4E8	7.0E8	6.6E8

The pressure broadenning is expressed in the Troe form.

REFERENCES:

Tsang and Hampson (1986)

Tsang, W., and Hampson, R.F. (1986) J. Phys. Chem. Ref. Data 15, 1087.

Troe (1977)

Troe, J. (1977) J.Chem.Phys. 66, 4745.

Frank and Just (1980)

Frank, P., and Just, T. (1980) Combust. Flame 38, 231.

Sidhu et al. (1992)

Sidhu, S.S., Kern, R.D., Xie, K., Chen, H., and Harding, L.B. (1992) Combust. Sci. Techn. 82, 101.

                        PRESSURE = 0.1 atm N2  
______________________________________________________________________
    Temp      delta-S     delta-H      kf          kr         Keq     
     (K)    (cal/mol K)  (kcal/mol) ----(mol,cm3,s)-----   (cm3/mol)  
______________________________________________________________________
                                                                      
     300       -30.4      -132.9    1.32E+14    3.66E-81    3.60E+94
     500       -32.3      -133.6    4.02E+13    4.41E-43    9.12E+55
    1000       -33.6      -134.6    3.11E+12    3.33E-15    9.34E+26
    1500       -34.1      -135.1    4.38E+11    2.07E-06    2.11E+17
    2000       -34.3      -135.5    1.04E+11    3.14E-02    3.32E+12
    2500       -34.4      -135.6    3.51E+10    7.77E+00    4.52E+09
    3000       -34.3      -135.5    1.45E+10    2.53E+02    5.75E+07
______________________________________________________________________


                        PRESSURE = 1 atm N2    
______________________________________________________________________
    Temp      delta-S     delta-H      kf          kr         Keq     
     (K)    (cal/mol K)  (kcal/mol) ----(mol,cm3,s)-----   (cm3/mol)  
______________________________________________________________________
                                                                      
     300       -30.4      -132.9    2.55E+14    7.07E-81    3.60E+94
     500       -32.3      -133.6    1.01E+14    1.10E-42    9.12E+55
    1000       -33.6      -134.6    1.29E+13    1.38E-14    9.34E+26
    1500       -34.1      -135.1    2.49E+12    1.18E-05    2.11E+17
    2000       -34.3      -135.5    6.89E+11    2.08E-01    3.32E+12
    2500       -34.4      -135.6    2.58E+11    5.72E+01    4.52E+09
    3000       -34.3      -135.5    1.16E+11    2.02E+03    5.75E+07
______________________________________________________________________


                        PRESSURE = 10 atm N2   
______________________________________________________________________
    Temp      delta-S     delta-H      kf          kr         Keq     
     (K)    (cal/mol K)  (kcal/mol) ----(mol,cm3,s)-----   (cm3/mol)  
______________________________________________________________________
                                                                      
     300       -30.4      -132.9    3.10E+14    8.61E-81    3.60E+94
     500       -32.3      -133.6    1.63E+14    1.79E-42    9.12E+55
    1000       -33.6      -134.6    3.69E+13    3.95E-14    9.34E+26
    1500       -34.1      -135.1    9.06E+12    4.29E-05    2.11E+17
    2000       -34.3      -135.5    3.10E+12    9.35E-01    3.32E+12
    2500       -34.4      -135.6    1.40E+12    3.09E+02    4.52E+09
    3000       -34.3      -135.5    7.37E+11    1.28E+04    5.75E+07
______________________________________________________________________