Spin Relaxation Effects on the ESR Spectrum of Gaseous Oxygen Atoms
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概要
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The linewidths of the single-quantum transitions of O(<SUP>3</SUP><I>P</I><SUB>1</SUB>) and O(<SUP>3</SUP><I>P</I><SUB>2</SUB>) in gaseous diluents, such as oxygen molecules and an inter gas, are measured with an ESR spectrometer of a usual type. The cross sections calculated from the pressure broadening are given. With regard to the multiple-quantum transitions in the Zeeman sub-levels of O(<SUP>3</SUP><I>P</I><SUB>2</SUB>) the dependence of the linewidths on the pressure is duscussed. The spin-lattice relaxation time, <I>T</I><SUB>1</SUB> for the single-quantum transitions of O(<SUP>3</SUP><I>P</I><SUB>2</SUB>) or O(<SUP>3</SUP><I>P</I><SUB>2</SUB>) is evaluated by employing the standard power saturation technique, and the effectiveness of an inert gas on <I>T</I><SUB>1</SUB> is studied. The spin-lattice relaxation between the Zeeman sublevels of the O atom is caused by the coupling between the orbital momentum and the electron-spin state upon collision. With regard to the multiple-quantum, the relaxation mechanism is also studied. Finally, we study the relationship between the spin-lattice relaxation time, <I>T</I><SUB>1</SUB>, and the corresponding probabilities of <I>ΔM<SUB>J</SUB></I>=±1, <I>ΔM<SUB>J</SUB></I>=±2, <I>ΔM<SUB>J</SUB></I>=±3, and <I>ΔM<SUB>J</SUB></I>=±4 transition induced by collisions.
- 公益社団法人 日本化学会の論文
著者
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MORI Yuji
Department of Animal Resource Science, The University of Tokyo
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Tanaka Ikuzo
Department of Chemistry, Tokyo Institute of Technology
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Jinguji Mamoru
Department of Chemistry, Tokyo Institute of Technology
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