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We performed shock tube study of the thermal decomposition of methyl butanoate(MB)using recently developed tunable diode laser absorption diagnostics.This paper extends the previous work by Farooq et al.[1] of MB pyrolysis by taking advantages of new advancements in laser absorption sensors.Shock tube experimental conditions covered a temperature range of 1259–1521 K and pressure of~1.5 atm.A much lower reactant concentration of 0.2%was used instead of 2–3%by Farooq et al.[1] to eliminate large uncertainties in absorption cross-sections during the endothermic pyrolysis process.Here we replicate the comparison of model predictions of CO2 yields during MB pyrolysis and shock tube measurements by Farooq et al.[1] in Fig.1,showing that all simulations of CO2 production [2-5] were underpredicted significantly.In the current study,new discoveries of CO2 and CO yields were observed during MB pyrolysis.Reaction pathway and sensitivity analyses were performed according to the current CO2/CO measurements and detailed kinetic modeling.