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Fast nuclear-spin conversion of H$$_{2}$$ trapped and polarized in a CO$$_{2}$$ matrix

CO$$_{2}$$マトリックス内に束縛されて分極したH$$_{2}$$の高速核スピン転換

山川 紘一郎; 石橋 篤季*; 波吉 敏信*; 東 優一*; 荒川 一郎*

Yamakawa, Koichiro; Ishibashi, Atsuki*; Namiyoshi, Toshinobu*; Azuma, Yuichi*; Arakawa, Ichiro*

The clear evidence for the nuclear spin conversion of matrix-isolated H$$_{2}$$ is presented. We trapped H$$_{2}$$ in a CO$$_2$$ film at 5.4 K and detected the induced infrared-absorption band including both the components of ortho and para H$$_{2}$$. By analyzing its time-evolution, the conversion rate was determined to be 9.4 $$times$$ 10$$^{-4}$$ s$$^{-1}$$. We confirmed that this fast conversion was induced just by the CO$$_2$$ film with the uniquely unstable structure. We also identified H$$_{2}$$ at another kind of trapping sites, accompanied by higher anisotropy of the confining potential, and estimated its conversion rate to be 6 $$times$$ 10$$^{-3}$$ s$$^{-1}$$.

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パーセンタイル:100

分野:Materials Science, Multidisciplinary

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