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©NIST, 2013
Accessibility information
Author(s):   Ayling, S.; Gao, Y. D.; Marshall, P.
Title:   Kinetic studies of the reaction of atomic sulfur with acetylene
Journal:   Proc. Combust. Inst.
Volume:   35
Page(s):   215 - 222
Year:   2015
Book Title:   ''
Editor:   ''
Publisher:   ''
Publisher address:   ''
Comments:   ''
Reference type:   Journal article
Squib:   2015AYL/GAO215-222

Reaction:   C2H2 + S → Products
Reaction order:   2
Temperature:   295 - 1015 K
Pressure:  1.00E-2 - 0.50 bar
Rate expression:   2.1x10-11 [cm3/molecule s] e-11200 [J/mole]/RT
Category:  Experiment
Data type:   High or low pressure extrapolation
Pressure dependence:   Rate constant is high pressure limit
Experimental procedure:   Static or low flow - Data taken vs time
Excitation technique:   Flash photolysis (laser or conventional)
Time resolution:   In real time
Analytical technique:   Resonance fluorescence
Comments:   The rate constant for reaction of sulfur atoms with acetylene was measured experimentally. A pressure-dependence was observed at all temperatures, revealing that adduct formation is the dominant reaction channel. The necessary stability suggests H2CCS or possibly HCCSH are the products at high temperatures, so that the reaction is spin-forbidden. The fall-off curves were fitted with a fixed broadening factor Fcent = 0.6. Reaction potential energy surface was studied using quantum chemistry and product channels were analyzed.

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Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [cm3/molecule s]
295 2.18E-13
300 2.36E-13
350 4.47E-13
400 7.24E-13
450 1.05E-12
500 1.42E-12
550 1.81E-12
600 2.22E-12
650 2.64E-12
700 3.07E-12
750 3.48E-12
800 3.90E-12
850 4.30E-12
900 4.70E-12
950 5.09E-12
1000 5.46E-12
1015 5.57E-12