Mid-Infrared Imaging Spectroscopy of N2O Solid Simulating the haze of trans-Neptunian objects
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
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2025
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| _version_ | 1866916672594509824 |
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| author | Takama, Daiki Koga, Ryoichi Negishi, Shohei Zhao, Biao Li, Yuan Hirahara, Yasuhiro Ito, Fumiyuki |
| author_facet | Takama, Daiki Koga, Ryoichi Negishi, Shohei Zhao, Biao Li, Yuan Hirahara, Yasuhiro Ito, Fumiyuki |
| contents | \ Nitrous oxide (N$_2$O) ice is likely to exist in trans-Neptunian objects such as Pluto and Triton, potentially formed through ultraviolet (UV) radiation from the Sun or cosmic ray irradiation of N$_2$ and CO ices. However, the mid-infrared spectral characteristics of N$_2$O ice in higher temperature regions (90-110 K), changes in mid-infrared spectra during UV irradiation, and the chemical network of nitrogen oxide (N$_x$O$_y$) ices remain insufficiently understood. This study aims to elucidate these aspects through in-situ mid-infrared spectral measurements of cryogenic particles using two-dimensional imaging Fourier transform infrared spectroscopy.
Spectroscopic imaging confirmed strong absorption at 7.75 $μ$m (N$_2$O $ν_1$ vibrational mode), with weaker vibrational modes observed at 8.60 $μ$m (N$_2$O 2$ν_2$), 7.27 $μ$m (N$_2$O torsion), and 5.29 $μ$m (N$_2$O $ν_1$+$ν_2$). Annealing experiments simulating high-temperature conditions demonstrated that all vibrational modes irreversibly intensified with increasing temperature, indicating progressive crystallization. New spectral features appeared at approximately 12 $μ$m and 14 $μ$m at the condensed sample.
N$_2$O ice was exposed to ultraviolet radiation (190-340 nm) using a D$_2$ lamp for 8.5 hours to investigate spectral changes during UV irradiation. After 60-90 minutes of irradiation, all N$_2$O vibrational modes disappeared, while absorption intensities of various nitrogen oxides, including NO, NO$_2$, N$_2$O$_3$, and O$_3$ increased. Beyond 180 minutes, vibrational modes of multiple nitrogen oxide ices exhibited intensity variations across different wavelengths, corresponding to other species such as cis-(NO)$_2$, N$_2$O$_4$, and N$_2$O$_5$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_02210 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mid-Infrared Imaging Spectroscopy of N2O Solid Simulating the haze of trans-Neptunian objects Takama, Daiki Koga, Ryoichi Negishi, Shohei Zhao, Biao Li, Yuan Hirahara, Yasuhiro Ito, Fumiyuki Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Chemical Physics \ Nitrous oxide (N$_2$O) ice is likely to exist in trans-Neptunian objects such as Pluto and Triton, potentially formed through ultraviolet (UV) radiation from the Sun or cosmic ray irradiation of N$_2$ and CO ices. However, the mid-infrared spectral characteristics of N$_2$O ice in higher temperature regions (90-110 K), changes in mid-infrared spectra during UV irradiation, and the chemical network of nitrogen oxide (N$_x$O$_y$) ices remain insufficiently understood. This study aims to elucidate these aspects through in-situ mid-infrared spectral measurements of cryogenic particles using two-dimensional imaging Fourier transform infrared spectroscopy. Spectroscopic imaging confirmed strong absorption at 7.75 $μ$m (N$_2$O $ν_1$ vibrational mode), with weaker vibrational modes observed at 8.60 $μ$m (N$_2$O 2$ν_2$), 7.27 $μ$m (N$_2$O torsion), and 5.29 $μ$m (N$_2$O $ν_1$+$ν_2$). Annealing experiments simulating high-temperature conditions demonstrated that all vibrational modes irreversibly intensified with increasing temperature, indicating progressive crystallization. New spectral features appeared at approximately 12 $μ$m and 14 $μ$m at the condensed sample. N$_2$O ice was exposed to ultraviolet radiation (190-340 nm) using a D$_2$ lamp for 8.5 hours to investigate spectral changes during UV irradiation. After 60-90 minutes of irradiation, all N$_2$O vibrational modes disappeared, while absorption intensities of various nitrogen oxides, including NO, NO$_2$, N$_2$O$_3$, and O$_3$ increased. Beyond 180 minutes, vibrational modes of multiple nitrogen oxide ices exhibited intensity variations across different wavelengths, corresponding to other species such as cis-(NO)$_2$, N$_2$O$_4$, and N$_2$O$_5$. |
| title | Mid-Infrared Imaging Spectroscopy of N2O Solid Simulating the haze of trans-Neptunian objects |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Chemical Physics |
| url | https://arxiv.org/abs/2504.02210 |