An ESR study of hydrogen atoms in methane-air flame.
スポンサーリンク
概要
- 論文の詳細を見る
In order to give a basis for the utilization of ESR in combustion chemical studies, both diffusion flames and premixed flames of a methane–air mixture have been studied by the flame-in-cavity ESR method. A pair of spectral lines separated by 51.0 mT due to H atoms and a very weak single line due to unidentified reaction intermediates have been recorded from combusting gases in a modified Bunsen burner. The H atoms in the diffusion flame give the spectral linewidth of 0.15 mT and populate a confined region near the luminous cone. In the premixed flame, the H atom concentration is the highest at the outside of the luminous inner cone (reaction zone), but it is distributed as long as 4 cm along the gas stream. The profile of the local concentration has been obtained by the deconvolution method from the observed dependence of the spectral intensity on the location of the flame in the resonant cavity. The maximum concentration can be estimated to be 2.4×10<SUP>15</SUP> atoms/cm<SUP>3</SUP>, which is much higher than the equilibrium concentration calculated from the flame temperature. 1200 K, and the oxygen excess ratio, 0.67. The spectral linewidth (0.01–0.04 mT) and the microwave power saturation of the H atoms depend on the location in the flame. These results strongly suggest that the line broadening and the spin relaxation are principally determined by the collision between the H atoms and the molecular oxygen.
- 公益社団法人 日本化学会の論文
著者
-
Yoshida Hiroshi
Faculty Of Math Kyushu Univ.
-
Noda Shoji
Faculty of Engineering, Hokkaido University
-
Miura Masazumi
Faculty of Engineering, Hokkaido University
-
Yoshida Hiroshi
Faculty of Engineering, Hokkaido University
関連論文
- 3P-274 多細胞の条件指標と最大多様性指標の関係式は、楕円曲線を含んでいる(生命の起源・進化,第46回日本生物物理学会年会)
- Controllability of Multiple Input Discrete-Time Linear Systems with Positive Controls
- Medium Effect on Chemical Reactions : Hydrogen Abstraction from Alkanes in Liquid and Solid Phases
- 2F1536 Regenerative equations of Dachsous=Fat heterodimeric system(Mathematical biology 2,The 48th Annual Meeting of the Biophysical Society of Japan)
- 1P302 Cleavage Automata for the egg cleavage and the cockroach leg regeneration(Mathematical biology,The 48th Annual Meeting of the Biophysical Society of Japan)
- The temperature dependence of the localization and scavenging of electrons in a glassy 2-methyltetrahydrofuran matrix.
- On the EPR Emission Spectrum of Transient Naphthosemiquinone Radical
- ESR and mass-spectrometric studies of methanol combustion. III. The effect of CS2 and CH3NH2 additions on the concentration profiles of chemical species in a methanol-air flame.
- ESR and mass spectrometric studies of methanol combustion. II. Correlation between labile and stable chemical species in methanol-oxygen-argon flame at low pressure.
- The ESR detection of N atoms in methane-air combustion flames doped with nitrogen compounds.
- Solvatochromic Shift of Aromatic Ketyl Anions due to Hydrogen Bonding.
- Energy transfer in .GAMMA.-irradiated cyclohexane-benzene mixture studied by spin trapping-ESR technique.
- Spin-trapping reactions in .GAMMA.-irradiated benzene solutions. Generation of authentic spin-adduct radicals.
- ESR studies of bunsen-type methane-air flames. II. The effects of the addition of halogenated compounds to the secondary air on the hadrogen atoms in the flame.
- Radical-ion interaction. Diphenylmethyl and triphenylmethyl radical generated by the dissociative electron attachment to halogenated compounds in rigid matrices.
- Pentamethylnitrosobenzene as a spin-trapping agent.
- Isothermal Decay of Trapped Electron in Irradiated 2-Methyltetrahydrofuran Glass
- Esr studies on the free radical intermediates in the photoreduction of duroquinone in alcohol solutions.
- Kinetic studies of spin-trapping reactions. I. The trapping of the t-butyl radical generated by the photodissociation of 2-methyl-2-nitrosopropane by several spin-trapping agents.
- Kinetic studies of spin trapping reactions. III. Rate constants for spin trapping of the cyclohexyl radical.
- An ESR study of hydrogen atoms in methane-air flame.
- The Effect of Temperature on the Formation of Benzyl Radical-Halide Ion Complexes in γ-Irradiated Organic Glassy Matrices
- ESR studies of the photoreduction of quinones. II. The reinterpretation of semiquinone intermediates from halogenated p-benzoquinones in ethanol.
- Photoreduction of quinones. I. One-electron transfer to p-benzoquinone in ethanol studied by ESR during continuous photolysis.
- Electronic spectra of some aromatic free radicals.
- Electron trapping in irradiated NaOH ices. Electrons stabilized at 4 K in shallow traps associated with Na+ cations.
- Behavior of Positive Hole in a γ-Irradiated 3-Methylpentane Glass at 77°K
- 1D1510 A model of cell-division stop for the limb regeneration(Development, Differentiation, Neuroscience,Oral Presentation,The 50th Annual Meeting of the Biophysical Society of Japan)
- ESR studies of bunsen-type methane-air flames. I. Effects of the entrainment and diffusion of secondary air on the chemical reactions in the flame.
- ESR and mass-spectrometric studies of methanol combustion. I The correlation between labile and stable chemical entities in free-burning methanol-air flames under atmospheric pressure.