| Project/Area Number |
10640493
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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 | KYUSHU UNIVERSITY |
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Principal Investigator |
IMAJO Takashi Kyushu University Graduated School, Research Associate, 大学院・理学研究科, 助手 (40213227)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Takehiko Kyushu University Graduated School, Professor, 大学院・理学研究科, 教授 (00011586)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | Zeeman modulation, / FTIR, / High resolution spectroscopy / フーリエ変換赤外分光法 |
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| Research Abstract |
Theory Theoretical analysis has made for z Zeeman modulated interferogram of rapid scanning FTR. It is believed that a modulation frequency(fM) must be at least one or two magnitude higher than a frequencies of interferogram(fF)to eliminate modulation signals from interferogram by electronic low pass filter. This leads a practical modulation frequency of 〜20 kHz. For the Zeeman modulation, the modulation frequency of 20 kHz is sometimes difficult to achieve, so some modification which avoids a limitation of fM ≫fF. In this work low pass filter in a lock in amplifier was removed and demodulated interferogram was accumulated in the memory of the computer. Accumulation of the interferogram was showed to eliminate a modulation signal. This method allow us to use a Zeeman modulation with 20 Hz for rapid scanning FTIR.
Measurements Absorption cell equipped a solenoid coil which generated an ac magnetic field of 500 G at 20 Hz. Absorption spectrum of nitric oxide was measured at a resolution of 0.005 cmィイD1-1ィエD1. Nitric oxide has unpaired electron, leading a Zeeman effect. The vibrational spectrum of nitric oxide was selectively measured from IR back ground which is not affected by external magnetic field.
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