A study of carbon monoxide (CO) dissociation was performed in a shock tube at conditions relevant to the high-speed entry of Venus and Mars atmospheres. The CO number density (or mole fraction) and the temperature are probed behind reflected shock waves at 1 MHz using scanned-wavelength laser absorption spectroscopy near 2011    cm 1 ( 4.97    μ m ). The wide range of vibrational states ( v = 1 , 4 , 8 , and 10) probed by this technique enables precise number density and temperature measurements up to and above 9000 K using a Boltzmann population fit of the resolved spectral lines. Mixtures of CO diluted in Ar at 3–60% are shock-heated in a wide range of conditions ( T 5 = 4650 11, 150    K at p 5 = 0.26 4.07    atm ) and compared to state-of-the-art chemical kinetic models. The time-resolved measurements of temperature and number density behind reflected shock waves are utilized to infer the rate coefficients of CO + M C + O + M for M = CO , Ar. They are found to be k diss , CO = 1.8 × 10 28 T 2.7 exp ( 129 , 000 / T )    cm 3 / ( mol s ) and k diss , Ar = 1.5 × 10 25 T 2.1 exp ( 129, 000 / T )    cm 3 / ( mol s ) .


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    Title :

    Carbon Monoxide Dissociation at Planetary Entry Conditions Examined by Megahertz-Rate Laser Spectroscopy



    Published in:

    Publication date :

    2024-02-03


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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