| Project/Area Number |
21684023
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Atomic/Molecular/Quantum electronics
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| Research Institution | Sophia University |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2009: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
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| Keywords | イオントラップ / クーロン結晶 / 低速分子線 / 極性分子 |
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| Research Abstract |
We have developed a new experimental apparatus to measure the reaction rates of cold ion-polar molecule reactions. First, the Stark velocity filter was developed for the generation of slow polar molecules. We have successfully produced slow ND_3, CH_2O, and CH_3CN beams with a peak velocity of 23～ 40 m/s. In particular, the generation of slow CH_3CN beam was carried out for the first time in this study. In addition, the number density of slow molecules was determined to be n=10^4～ 10^6 cm^<-3>, that is an important parameter to determine the reaction rate constant. Finally, the reaction rates between the Ca^+Coulomb crystals and the slow polar molecules were measured. The reaction rates are of the order of 10^<-6>～ 10^<-5> s^<-1>, which are very slow compared to a typical reaction rate of a molecular ion-polar molecule reaction at very low temperatures. This fact show that Ca^+is suitable for a coolant of sympathetic cooling of molecular ions, which are supplied for performing the reaction-rate measurements of cold ion-polar molecule reactions. This is an important achievement of this study.
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