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The rate constant, k(1) at 296 K for the reaction (NO(3) + NO(2)) to (NO + NO(2) + O(2)) has been determined relative to the rate constant, k(2), for the reaction NO(3) + NO to 2NO(2) by direct measurement of (NO) and (NO(2)) in a steady-state situation where the effect of the thermal decomposition of NO(3) was negligible. NO(3) was generated in the presence of a large excess of NO(2). The NO(2) was determined by FTIR while the NO was measured with a tunable diode laser spectrometer operated in second-harmonic detection mode. From a series of 18 experiments performed at 50 and 15 Torr total pressures, the rate constant k(1) was calculated at 296 K as k(1) = [(1.5 +- 0.28) x 1.0 E-26]/ k(2) cm3/molecule/s. Assuming the rate constant k(2) = (3.0 +- 0.9) x 1.0 E-11 cm3/molecule/s, a k(1) value at 296 K equal to (5.1 +- 1.8) x 1.0 cm3/molecule/s is calculated.

Additional information

Authors: HJORTH J, JRC Ispra (IT);CAPPELLANI F, JRC Ispra (IT);RESTELLI G, JRC Ispra (IT);NIELSEN C J, University of Oslo (NO)
Bibliographic Reference: Article: The Journal of Physical Chemistry, Vol. 93 (1989), pp. 5458-5461
Record Number: 199010081 / Last updated on: 1994-12-01
Original language: en
Available languages: en