| Project/Area Number |
09640617
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Physical chemistry
|
|---|
| Research Institution | Kyoto University of Education |
|---|
Principal Investigator |
IBUKI Toshio Kyoto University of Education, Department of Material Science, Professor, 教育学部, 教授 (30027065)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OKADA Kazumasa Hiroshima University Department of Chemistry, Research Assistant, 理学部, 助手 (90294511)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Project Status |
Completed (Fiscal Year 1998)
|
| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
|
|---|
| Keywords | K shell excitation / Photoionization / Photodissociation / Site selective reaction / Reaction control / 内殻電子 |
|---|
| Research Abstract |
Molecular size, sate, and shape effects on the specific fragmentation of the K shell excited polyatomic molecules were investigated for (a) triatomic O_3 and small molecules with methane-shape, (b) aromatics, and (c) aliphatic compounds. Synchrotron radiation was used for the soft X-ray source.
Total photoabsorption cross section of ozone in the 0 K edge was first observed, In the small CF_3CN and CCl_3CN molecules, site specific fragmentation was weak or negligible in the C K, N K, and Cl L shell excitations. Auger electron spectra measured support the present observation. In aromatic compounds the phenyl group in a molecule decomposes characteristically and thus the initial memory excited was mostly lost, In the N and 0 K shell excitations of aliphatic CH_3OCOCN and CH_3OCOCH_2CN molecules, molecular size effect was clearly observed. That is, in CH_3OCOCN site dependent fragmentation was very weak while in CH_3OCOCH_2CN the fragment patterns were largely different between the N(1s) and O(1s) electron excitations. Site selective fragmentation was more evidently observed in the N and O K shell excitations of CH_3COCH_2CH_2CH_2CN in which five carbon atoms separate the interesting N and O atoms. Electronic state-specific fragmentation was observed in the pi*_<CN>*N(1s) resonance excitation of CH_3OCOCH_2CN and CH_3O(CH_2)_3CN in which N^+ and CO^+ fragment ions were exclusively produced.
From the research results in the present study it might be expected that inner core excitation by using soft X-ray will be a useful tool for cutting a chemical bond in molecule such as a surgical knife in near future.
|
