| Project/Area Number |
06453019
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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 |
Physical chemistry
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| Research Institution | Yamanashi University |
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Principal Investigator |
HIRAOKA Kenzo Yamanashi Univ.Fac.Eng.Professor, 工学部, 教授 (80107218)
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| Project Period (FY) |
1994 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1994: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | low-energy ion impact / ion impact / vander Waals thin film / reflection TOFMS / 低エネルギーイオン衝撃 / イオン衝突 / リフレクトロン型TOF / 多体効果 / イオン-固体衝突 / イオン-分子反応 / 飛行時間型質量分析計 |
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| Research Abstract |
The study on the interactions between the low-energy ions and solid surface is of fundamental importance in the field of plasma technology and ion-beam technology. In this study, the dynamics of the low-energy ion impact on the van der Waals thin films were studied in detail. The newly designed reflectron-type TOF mass spectrometer was installed in the ultra-high vacuum chamber. The pulsed ion beam was injected into the van der Waals thin film deposited on the cold head of the cryocooler at 7 K.
When the film was bombarded by the He^+ ions, the cluster ions were hardly observed. Instead, fragment ions are formed with strong intensities. This is due to the fact that the kinetic energy of the small-size He^+ ion is mainly dissipated by the electronic excitation in the ion-solid collision events. In contrast, much more efficient momentum transfer takes place in the collision of Ne^+ with the solid films. The efficient momentum transfer in the collision events leads to the shock wave formation in the ion track. This results in the abundant cluster ion formation.
In sum, the holes and excitons formed in the matrix play very important roles in the secondary ion formatin.
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