Measurement of absolute rate data for the reaction of atomic potassium, K(42S½), with CH3F, C2H5F, C6H5F, CH3Br, C2H5Br, HCl and HBr by time-resolved atomic resonance absorption spectroscopy at λ = 404 nm (K(52PJ) ← K(42S½))
✍ Scribed by D. Husain; Y. H. Lee
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 846 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
We present a kinetic study of atomic potassium in its electronic ground state, K(4'SI 21, generated in the "single-shot mode" by pulsed irradiation at elevated temperatures and monitored by time-resolved atomic resonance absorption spectroscopy using the Rydberg doublet at A = 404 nm (K[5'PJ] +K[42S1,2]). Profiles for the decay of atomic potassium in the presence of various halogenated reactants were recorded at different temperatures, yielding the following Arrhenius parameters (KR = A exp(-E/RT), errors l r ) : R A/lO-'' cm3 molecule-' s-' E / k J mol.' Temp. Range 59 t 3.3 822-922 K + 1.1 CH,F 1.93 -0.7 62 % 6.6 694-807 K + 2.5 41 % 3.9 705-812 K + 1.6 + 0.3 15.9 i 1.2 798-903 K -0.2 34.7 ? 3.5 828-902 K + 3.5 34 t 1.2 836-925 K + 0.3 1.9 -0.3 GHsF 1.40 -0.9 2.0 ~ 0.9 CkH,F CHIBr HCl HBr 5.6 ~ 2.1 A limited body of data is reported for K
for the temperature range 704-733 K. These results for atomic potassium constitute a new body of absolute rate data which are compared with some previous results for reactions of atomic potassium with other reactants, and for reactions of atomic sodium, also determined by time-resolved atomic resonance absorption spectroscopy. The data for HC1 and HBr are finally compared with early estimates reported using diffusion flames.