| Project/Area Number |
25287148
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geochemistry/Cosmochemistry
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
NAKAI Yoichi 国立研究開発法人理化学研究所, 仁科加速器研究センター, 専任研究員 (30260194)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Naoki 北海道大学, 低温科学研究所, 教授 (50271531)
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| Co-Investigator(Renkei-kenkyūsha) |
KOJIMA Takao 国立研究開発法人理化学研究所, 仁科加速器研究センター, 専任研究員 (90211896)
HIDAKA Hiroshi 北海道大学, 低温科学研究所, 助教 (00400010)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2015: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2014: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2013: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Keywords | クラスターイオン / 大気イオン化学 / 微粒子核生成 / 原子分子物理 |
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| Outline of Final Research Achievements |
We performed stable and precise measurements compared with previous studies for Gibbs free energy changes of stepwise association reactions of a water molecule to H3O+(H2O)n ions using a ion drift tube with a selected ion injection. Furthermore, an empirical effective temperature of the reaction equilibrium constants was obtained for association/dissociation reactions of a water molecule to/from H3O+(H2O)n ions in a pure water vapor. The effective temperature means a representative physical quantity of collision energy influenced by an electric field. It was found that a new parameter describing electric field dependence of the effective temperature presumably reflects structures of H3O+(H2O)n ions. We also performed R&D of ion handling methods in an RF ion trap, such as an ion mass selection, in order to make use of RF ion traps for cluster formation experiments.
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