| Project/Area Number |
23654144
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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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) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | イオントラップ / クーロン結晶 / 分子イオン / 共同冷却 |
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| Research Abstract |
We have developed a compact cryogenic linear ion trap to producerovibrationally cold molecular ions embeded in an ion Coulomb crystal. First, the compact cryogeniclinear ion trap with double radiation shields was newly developed and was connected to a 10 Kcryocooler. Then, we performed laser cooling experiments of trapped Ca+ions. We have successfullygenerated Ca+Coulomb crystals containing more than a few thousands ions under low-temperatureenvironments of about 50 K. We also succeeded in producing cold CaH+ions, which are generated bylaser-induced reactions between Ca+*(2P1/2) and H2 molecules. A few thousands of cold CaH+ions aremaintained over one hour under the low-temperature environments. The results imply that thepopulation of the rotational ground state (J = 0) of CaH+is increased to 13%, while the roomtemperature population is only 2%. It is noted that in this condition the sum of J = 0-3 populationreaches to 90% and the vibrational ground state is attained (the vibrational constant is about 0.18 eV).This is an important achievement to perform rovibrational spectroscopy of CaH+.
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