Generation of oxygen atoms during laser photoly-sis of O2 behind reflected shock waves and the ki-netics of their interaction with methane


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The paper presents the first experimental results of measuring the time profiles of atomic oxygen concentration by atomic resonance absorption spectroscopy (ARAS, 130.5 nm) obtained using the developed experimental complex combining shock-wave heating and pulsed laser photolysis (LP, 193 nm) of gas mixtures. Using the example of photolysis of oxygen molecules and the reaction of O atoms with methane, the capabilities of the de-veloped setup for studying the kinetics of elementary reactions are demonstrated. The temperature dependence of the absorption cross section of oxygen and methane mole-cules for a wavelength of 130.5 nm is obtained. The efficiency of oxygen atom for-mation during LP of oxygen molecules is determined in the temperature range of 700–1900 K at laser pulse energies of 300–400 mJ. The rate constant of the reaction of oxy-gen atoms with methane at temperatures of 770–1900 K and pressures of 3–4 bar is ob-tained. Additionally, numerical modeling of experimental profiles was carried out using current kinetic schemes of hydrocarbon combustion.

laser photolysis, shock waves, atomic resonance absorption spectroscopy, oxidation, oxygen, methane

DOI: http://doi.org/10.33257/PhChGD.25.5.1128

Nikita Sergeevich Bystrov, Alexander V. Emelyanov, Alexander V. Eremin, Elizaveta Kurbatova, Pavel I. Yatsenko

Volume 25, issue 5, 2024 year


Генерация атомов кислорода при лазерном фотолизе О_2 за отраженными ударными волнами и кинетика их взаимодействия с метаном

Представлены первые экспериментальные результаты измерений временных про-филей концентрации атомарного кислорода методом атомно-резонансной абсорбционной спектроскопии (АРАС, 130.5 nm), полученные на созданном экспериментальном комплексе, сочетающем ударно-волновой нагрев и импульсный лазерный фотолиз (ЛФ, 193 nm) газовых смесей. На примере фотолиза молекул кислорода и реакции метана с атомами О показаны возможности созданной установки для исследования кинетики элементарных реакций. Получена температурная зависимость сечения поглощения молекул кислорода и метана для длины волны 130.5 nm. Определена эффективность образования атомов кислорода при ЛФ молекул кисло-рода в диапазоне температур 700–1900 K при энергиях лазерного импульса 300–400 мДж. Получена константа скорости реакции взаимодействия атомов кислорода с метаном при температурах 770–1600 К и давлениях 3–4 бар. Дополнительно, проведено численное моделирование экспериментальных профилей с использованием актуальных кинетических схем горения углеводородов.

лазерный фотолиз, ударные волны, атомно-резонансная абсорбционная спектроскопия, окисление, кислород, метан

DOI: http://doi.org/10.33257/PhChGD.25.5.1128

Nikita Sergeevich Bystrov, Alexander V. Emelyanov, Alexander V. Eremin, Elizaveta Kurbatova, Pavel I. Yatsenko

Volume 25, issue 5, 2024 year



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