| Project/Area Number |
17540215
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
WADA Setsuko The University of Electro-Communications, faculty of Electro-Communications, Associate Professor (30017404)
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| Co-Investigator(Kenkyū-buntansha) |
ONO Hiroshi The University of Electro-Communications, Faculty of Electro-Communications, Research Associate (00134867)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,410,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | diffuse cloud / plasma / olivine / enstatite / silicate / UV / interstellar dust / carbonaceous material / 光電子放出 / 変質 / パイロキシン / 水素プラズマ / アモルファス炭素 / X線光電子分光 / 表面 / マイクロ波 |
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| Research Abstract |
In HII regions, dusts formed in circumstellar space of an aged stars will be processed and some of them will sublimate. But in outer regions of HII regions or in diffuse clouds, new dusts will be formed again from gases. The modified dusts and newly formed dusts would be catalysts for molecular formation reaction of in diffuse clouds. In this project, we examined (1) processing of silicates with H2 plasma, (2) synthesis of solids from a gas produced with silicates and H2 plasma, and (3) processing of carbonaceous material synthesized in laboratory (QCC) with UV irradiation.
Our study found that alteration of olivine occurred easier than enstatite by plasma processing. Their refractivity in optical region decreased and small particles of iron appeared in TEM images after processing. However, infrared spectra did not change by the processing. This means that the material close to the surface was altered. A new solid was formed in a gas sublimated from the silicate in the H2 plasma. The solid contained small silicon particles. The UV-VIS spectrum of the solid was very similar to that of silicon.
Emission of photoelectrons from the QCC was observed under UV irradiation. Infrared spectra of the QCC did not change after long time irradiation with 172nm-excimer lamp.
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