Single-collision gas-surface vibrational energy transfer in a reacting system

Gas-surface vibrational energy accommodation in a reactive system has been studied under single collision conditions. The reaction system is the isomerization of cyclobutene to 1,3-butadiene. Both seasoned pyrex and silica surfaces were used over the temperature ranges 400-775 K and 500-975 K, respectively. Strong collider behavior was observed below about 425 K. The vibrational energy accommodation coefficient was found to decrease with rise of temperature from about 1.0 to 0.2, while the relative collisional efficiency Beta sub 1 declined from about 1.0 to 0.008. A stochastic model was used to fit the data. (Author)