| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Research Abstract |
As a model of cosmic dust for bio-molecular growth in dark nebula at cryogenic temperature, a mixture of silica gel with solid parahydrogen was used for deterring the reactions of H atoms and other radicals at 4.2 K. We found that H atoms and methyl radicals never react in solid parahydrogen even though H atoms were diffused in solid parahydrogen. H atoms also did not react with TEMPO radicals adsorbed on the silica gels. H atoms can diffuse in solid parahydrogen only by tunneling reaction of H abstraction reaction. Solute molecules as methyl radicals or silica gels may distort the lattice structure of solid parahydrogen, to make difficult for diffusion of H atoms by the tunneling. This can be the main reason why such radical-radical reactions could not take place at 4.2 K.
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