| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2018: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
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| Outline of Final Research Achievements |
We measure the ortho-to-para ratios (OPRs) of water (H2O) photodesorbed from ice made from para-H2O monomers at 11 K. The photodesorbed H2O molecules from the ice have the statistical OPR value of three. This result clearly shows the immediate nuclear-spin-state mixing of H2O toward the statistical value of ice even at 11 K. The OPR of H2O thermally desorbed from the ice also shows the expected statistical value. These results indicate that the OPR of H2O desorbed from interstellar ice should be the statistical value regardless of the formation process of the ice, which cannot be used to deduce the ice-formation temperature. In addition, we developed an experimental setup for in situ infrared multiple-angle incidence resolution spectrometry in low temperature, ultrahigh-vacuum conditions. The intensity ratio between the in-plane and out-of-plane vibration spectra of amorphous N2O at 6 K reveals an average molecular orientation angle of 65° from the surface normal.
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