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

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 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 10 $^{-4}$ s $^{-1}$ . We confirmed that this fast conversion was induced just by the CO 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 10 $^{-3}$ s $^{-1}$ .

Language	:	English
Journal	:	Physical Review B
Volume	:	102
Number	:	4
Pages	:	p.041401_1 - 041401_5
Publication Year/Month	:	2020/07
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Paper URL	:	https://doi.org/10.1103/PhysRevB.102.041401
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Registration No. : AA20200396
JAEA Abstracts No. : 48001318
Paper Submission No. : 23558

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Fast nuclear-spin conversion of H trapped and polarized in a CO matrix

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