| Project/Area Number |
17550025
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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 |
Physical chemistry
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
SAITO Norio National Institute of Advanced Industrial Science and Technology, NMIJ, Section chief, 計測標準研究部門, 室長 (80344191)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | cluster / electron-ion multiple coincidence spectroscopy / Interatomic Coulombic decay / 同時計測 / 画像分光法 / 内殻イオン化 |
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| Research Abstract |
A cluster generation system was made in order to produce rare gas clusters efficiently. This system was mounted on an electron-ion multiple coincidence apparatus and de-excitation mechanism of size-selected clusters was investigated.
Interatomic Coulombic decay (ICD) from an Auger-final dicationic state is observed in the Ar dimer. A 2p inner-shell vacancy created by photoionization is replaced with 3s and 3p vacancies via intra-atomic Auger decay. The Auger-final dicationic state is subject to ICD in which one of the 3p electrons in the same Ar atom fills the 3s vacancy while one of the 3p electrons from the neighboring Ar atom is emitted as an ICD electron. This ICD process is unambiguously identified by electron-ion-ion coincidence spectroscopy in which the kinetic energy of the ICD electron and the kinetic energy release between Ar^+ and Ar^<2+> are measured in coincidence.
Auger electron spectra recorded in coincidence with two Ar^+ ions produced from Ar_2^<2+> suggest that the bound one-site two-hole state, Ar^<2+>(3p^<-2>)-Ar, decays further only via radiative charge transfer to the dissociative two-site two-hole states Ar^+(3P^<-1>)-Ar^+(3p^<-1>) The measured kinetic energy release of Ar_2^<2+> agrees well with the theoretical estimate based on this process.
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