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The thermal decomposition of methanol (CH3OH) was studied in4 both conventional and single-pulse shock tubes over the temperature and pressure ranges 950-2000 K and 1*5-12.5 atm., respectively. In both studies, highly diluted CH3OH mixtures in Ar were shock heated behind reflected waves. In the conventional shock tube infrared emission at both 3.47 and 9.56 M>m was monitored in order to measure CH3OH concentration as a function of time. The CH3OH concentration profiles were characterized by overall global expressions. Quenched samples from the single-pulse shock tube were analyzed by gas chromatography. The data obtained from the two sets of experiments were utilized to develop a 30 reaction mechanism which models the thermal decomposition of CH3OH better than previously proposed mechanisms.