| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Viljanen, Jan
UiT The Arctic University of Norway
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2023Detection of alkali path in a pilot-scale combustor using laser spectroscopy and surface ionization — From vapor to particlescitations
- 2021Alkali Monitoring of Industrial Process Gas by Surface Ionization─Calibration, Assessment, and Comparison to in Situ Laser Diagnosticscitations
- 2021In-situ monitoring of transient gas phase K-Cl-S chemistry in a pilot-scale combustorcitations
- 2020Sequential Collinear Photofragmentation and Atomic Absorption Spectroscopy for Online Laser Monitoring of Triatomic Metal Speciescitations
- 2020Analysis of ilmenite slag using laser-induced breakdown spectroscopycitations
- 2015Rate constant and thermochemistry for K + O2 + N2 = KO2 + N2citations
- 2015Rate constant and thermochemistry for K + O 2 + N 2 = KO 2 + N 2citations
Places of action
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article
Rate constant and thermochemistry for K + O2 + N2 = KO2 + N2
Abstract
The addition reaction of potassium atoms with oxygen has been studied using the collinear photofragmentation and atomic absorption spectroscopy (CPFAAS) method. KCl vapor was photolyzed with 266 nm pulses and the absorbance by K atoms at 766.5 nm was measured at various delay times with a narrow line width diode laser. Experiments were carried out with O<sub>2</sub>/N<sub>2</sub> mixtures at a total pressure of 1 bar, over 748-1323 K. At the lower temperatures single exponential decays of [K] yielded the third-order rate constant for addition,<i> k</i><sub>R1</sub>, whereas at higher temperatures equilibration was observed in the form of double exponential decays of [K], which yielded both <i>k</i><sub>R1</sub> and the equilibrium constant for KO<sub>2</sub> formation. <i>k</i><sub>R1</sub> can be summarized as 1.07 × 10<sup>-30</sup>(<i>T</i>/1000 K)<sup>-0.733</sup> cm<sup>6</sup> molecule<sup>-2</sup> s<sup>-1</sup>. Combination with literature values leads to a recommended <i>k</i><sub>R1</sub> of 5.5 × 10<sup>-26</sup><i>T</i><sup>-1.55</sup> exp(-10/<i>T</i>) cm<sup>6</sup> molecule<sup>-2</sup> s<sup>-1</sup> over 250-1320 K, with an error limit of a factor of 1.5. A vant Hoff analysis constrained to fit the computed ΔS<sub>298</sub> yields a K-O2 bond dissociation enthalpy of 184.2 ± 4.0 kJ mol<sup>-1</sup> at 298 K and Δ<sub>f</sub><i>H</i><sub>298</sub>(KO<sub>2</sub>) = -95.2 ± 4.1 kJ mol<sup>-1</sup>. The corresponding D<sub><i>0</i></sub> is 181.5 ± 4.0 kJ mol<sup>-1</sup>. This value compares well with a CCSD(T) extrapolation to the complete basis set limit, with all electrons correlated, of 177.9 kJ mol<sup>-1</sup>.