The vibration relaxation time of CO
2 (ν
4 mode) and dissociation rate constant are obtained by the 4.3 and 2.7μ infrared emission in wider region of temperature than the experimental data which have been published already.
Some new conclusions can be made from these measurements, i.e.,
1) All four normal modes of vibration are coupled at the temperature range of 500° to 5, 000°K.
2) At the temperature over 6, 000°K, dissociation rate constant, kdA was obtained by DAVIES, but his results were the ones by the reflected shock waves. Present results by the incident shock waves are obtained up to 8, 000°K, and show slight difference from DAVIES' ones.
3) ARRHENIUS plots of dissociation rate constants at the temperature range of 3, 000° to 8, 000°K show the decrement of the activation energy at the higher temperature. The mean value of the activation energy of this measurement is 87 kcal/mole, which is higher than the value of DAVIES' or STEINBERG's experiment.
4) The efficiency of CO2 as the third body in the CO2 dissociation reaction is obtained. At the temperature of 3, 000° to 3, 800°K, k
dCO
2/k
dA is approximately 2.5-4.5.
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