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Author(s):   Becker, K.H.; Kurtenbach, R.; Schmidt, F.; Wiesen, P.
Title:   Kinetics of the NCO Radical Reacting with Atoms and Selected Molecules
Journal:   Combust. Flame
Volume:   120
Page(s):   570 - 577
Year:   2000
Reference type:   Journal article
Squib:   2000BEC/KUR570-577

Reaction:   + NCOCO + NO
Reaction order:   2
Temperature:   302 - 757 K
Pressure:  3.33E-3 bar
Rate expression:   6.5x10-11 [±4.08x10-11 cm3/molecule s] (T/298 K)(-1.14±0.10)
Category:  Experiment
Data type:   Absolute value measured directly
Pressure dependence:   Rate constant is pressure dependent
Experimental procedure:   Flow tube - Data taken vs distance
Excitation technique:   Other
Time resolution:   In real time
Analytical technique:   Laser induced fluorescence
Comments:   248-nm photolysis of ClNCO/Ar mixtures used to generate NCO radicals.
O-atoms generated by microwave discharge in O2/Ar or CO2/Ar.
Concentration of O atoms established through NO2 chemiluminescence.
Unsymmetrical error limits reported. In the A-factor, (+3.2 and -2.2) x 10-8 and for n, (+0.08 and -0.12), in units of cm3s-1.
A pressure effect was indicated by a single point at 9.9 torr and 298K, with k = 10.24?.90 x 10-11 cm3s-1, about twice the rate constant at 2.5 torr.

View full bibliographic record.

Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [cm3/molecule s]
302 6.40E-11
325 5.89E-11
350 5.41E-11
375 5.00E-11
400 4.65E-11
425 4.34E-11
450 4.06E-11
475 3.82E-11
500 3.60E-11
525 3.41E-11
550 3.23E-11
575 3.07E-11
600 2.93E-11
625 2.79E-11
650 2.67E-11
675 2.56E-11
700 2.46E-11
725 2.36E-11
750 2.27E-11
757 2.25E-11