Table 3. Summary of the Absolute Measurements of k1a.
| T (K) | number of kinetic runs | [D9B] (1013molecule cm–3) | k1 (10–12) cm3 molecule–1 s–1 |
|---|---|---|---|
| 298b | 9 | 0.80–10.1 | 3.60 ± 0.41 |
| 335b | 11 | 0.55–9.68 | 3.40 ± 0.39 |
| 425c | 9 | 0.49–8.78 | 4.11 ± 0.47 |
| 500c | 9 | 0.13–11.1 | 4.70 ± 0.54 |
| 595c | 8 | 0.67–11.2 | 5.79 ± 1.32d |
| 670c | 11 | 0.14–5.14 | 8.12 ± 1.85d |
| 750c | 7 | 0.32–4.36 | 9.80 ± 2.23d |
The total pressure in the reactor was 2 Torr, with the linear flow velocity in the reactor between 1980 and 2100 cm s–1 and OH radical concentrations in the range of (2–3) × 1011 molecule cm–3. The combined uncertainty on k1 was estimated to be about 11% by adding in quadrature the statistical error (≤4%) and that on the measurements of the absolute concentration of D9B (∼10%), flows (3%), pressure (2%), and temperature (1%).
Halocarbon wax-coated reactor.
Uncoated quartz reactor.
The error includes the systematic uncertainty and 20% conservative error to include OH regeneration of high-temperature studies.