1998 Fiscal Year Final Research Report Summary
Development of ionization detected infrared spectroscopy and its application to overtone spectroscopy of molecules and clusters
| Project/Area Number |
09440206
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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 | Okazaki National Research Institutes, Institute for Molecular Science |
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Principal Investigator |
FUJII Masaaki Okazaki National Research Institutes, Institute for Molecular Science, Professor, 分子科学研究所, 教授 (60181319)
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| Co-Investigator(Kenkyū-buntansha) |
FUJII Masaaki Okazaki National Research Institutes.Institute for Molecular Science, Professor (60181319)
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| Project Period (FY) |
1997 – 1998
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| Keywords | IR SPectroscopy / Multiphoton Ionization / Double Resonance Spectrscopy / Higher Vibrational State / Intramolecular Vibrational Redistribution / Supersonic Jet |
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| Research Abstract |
A new IR spectroscopy has been developed.This spectroscopy named nonresonant ionization detected IR spectroscopy (shortly, NID-IR) is a kind of IR- UV double resonance spectroscopy which detects a vibrationally excited molecule by selective ionization due to a UV laser.Because of the ionization detection, NID-IR spectroscopy has very high sensitivity in comparison to the traditional IR spectroscopy due to direct absorption.The NID-IR spectroscopy has been applied to various molecules such as phenol, naphthol and caged amine.The IR transition of these molecule has observed in a supersonic jet condition.In special, IR transition of jet cooled phenol has successfully been observed from 2400 cm-1 to 14000 cm-1.The spectrum shows clear vibrational structures due to the first to the forth quantum of the OH stretching, CH overtones and various combination vibrations.The vibrational frequency, auharmonicity, and the dissociation energy of the OH stretching mode has been measured.It is found that the band width of OH overtones has been decreasing with increase in vibrational quantum number.From the comparison to the calculated band shape assuming slow relaxation, it is concluded that the band shape is mainly determined by the broadening due to the intramolecular vibrational redistribution (IVR).The existence of a doorway state in IVR of phenol has been suggested from the deuterium effect on the band shape.
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Research Products
(8 results)
