2010 Fiscal Year Final Research Report
Studies on fundamental processes on mass-independent isotope fractionation of sulfur compounds in photochemical rea ctions
| Project/Area Number |
20340157
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | Kyushu University |
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Principal Investigator |
NARAOKA Hiroshi Kyushu University, 大学院・理学研究院, 教授 (20198386)
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| Co-Investigator(Renkei-kenkyūsha) |
POULSON SIMON 米国ネバダ大学リノ校, 地球科学科, 教授
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| Research Collaborator |
MORIWAKI Emi 九州大学, 大学院・理学研究府・地球惑星科学専攻, 修士課程学生
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| Project Period (FY) |
2008 – 2010
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| Keywords | イオウ同位体 / 質量非依存同位体分別 / 光化学反応 / 紫外吸収スペクトル / 始生代堆積岩 / 大気進化 |
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| Research Abstract |
To investigate the interaction between UV photolysis of SO_2 and mass-independent isotope fractionation of sulfur (MIF-S) signatures, absorption cross sections of all S-substituted SO_2 isotopologues (^<32>SO_2, ^<33>SO_2, ^<34>SO_2, and ^<36>SO_2) were determined between 183 and 330 nm in every 0.05 nm using a double-beam spectrometer. The cross sections of SO_2 are very different for the four isotopologues from 183 to 230 nm. The MIF-S signature of SO_2 by irradiation using a 193 nm ArF laser is well explained by different photolysis rate of SO_2 using a kinetic model depending on cross section of each isotopologue. Absorption cross sections of O-substituted SO_2 isotopologues (^<32>S^<16>O^<18>O, ^<32>S^<18>O_2 ; ^<34>S^<16>O^<18>O,^<34>S^<18>O_2) were also estimated to clarify oxygen isotope variations associated with SO_2 photolysis.
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