A direct measurement of the CH 3 C(O)O 2 + NO gas-phase reaction rate coefficient over the temperature range 200−402 K was made using chemical ionization mass spectrometric detection of the CH 3 C(O)O 2 reactant. A significant temperature dependence was observed, and a temperature dependent expression of k ( T ) = (8.1 ± 1.3) × 10 -12 exp{(270 ± 60)/ T } cm 3 molecule -1 s -1 was determined. The 298 K rate coefficient, k = (2.0 ± 0.3) × 10 -11 cm 3 molecule -1 s -1, agrees well with results from previous indirect measurements. NO 2, CH 3, and CO 2 were positively identified as products originating from the reaction. The question of whether CH 3 and CO 2 are direct products of the reaction or result from the thermal decomposition of CH 3 C(O)O could not be answered. The 298 K rate coefficients for the reactions of SF 6 -, I -, and O 3 - with CH 3 C(O)O 2 were measured to be ( ) × 10 -10, ( ) × 10 -10, and ≥2 × 10 -10 cm 3 molecule -1 s -1, respectively.
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Villalta et al. (1996) studied this question.