Zobrazeno 1 - 10
of 195
pro vyhledávání: '"Tsuge, Masashi"'
Methane (CH4) is one of the major components of the icy mantle of cosmic dust prevalent in cold, dense regions of interstellar media, playing an important role in the synthesis of complex organic molecules and prebiotic molecules. Solid CH4 is consid
Externí odkaz:
http://arxiv.org/abs/2407.13057
The photodesorption efficiencies of the hydroxyl (OH) radical from the water ice surface were measured in the range of 310-700 nm for the first time. Although isolated H$_2$O molecules and OH radicals do not absorb visible photons, the photodesorptio
Externí odkaz:
http://arxiv.org/abs/2406.02984
Autor:
Meng, Qingkuan, Chang, Qiang, Zhao, Gang, Quan, Donghui, Tsuge, Masashi, Zhang, Xia, Zhang, Yong, Li, Xiao-Hu
Recent experiments show that the desorption energy of H$_2$ on a diamond-like carbon (DLC) surface depends on the H$_2$ coverage of the surface. We aim to quantitatively explain the coverage dependent H$_2$ desorption energy measured by the experimen
Externí odkaz:
http://arxiv.org/abs/2309.12587
Publikováno v:
Nat Astron (2023)
Many interstellar complex organic molecules (COMs) are believed to be produced on the surfaces of icy grains at low temperatures. Atomic carbon is considered responsible for the skeletal evolution processes, such as C-C bond formation, via insertion
Externí odkaz:
http://arxiv.org/abs/2308.02181
Chemical processes on the surface of icy grains play an important role in the chemical evolution in molecular clouds. In particular, reactions involving non-energetic hydrogen atoms accreted from the gaseous phase have been extensively studied. These
Externí odkaz:
http://arxiv.org/abs/2205.15472
Hydrogen molecules have two nuclear spin isomers: ortho-H2 and para-H2. The ortho-to-para ratio (OPR) is known to affect chemical evolution as well as gas dynamics in space. Therefore, understanding the mechanism of OPR variation in astrophysical env
Externí odkaz:
http://arxiv.org/abs/2109.12734
Autor:
Kouchi, Akira, Tsuge, Masashi, Hama, Tetsuya, Oba, Yasuhiro, Okuzumi, Satoshi, Sirono, Sin-iti, Momose, Munetake, Nakatani, Naoki, Furuya, Kenji, Shimonishi, Takashi, Yamazaki, Tomoya, Hidaka, Hiroshi, Kimura, Yuki, Murata, Ken-ichiro, Fujita, Kazuyuki, Nakatsubo, Shunichi, Tachibana, Shogo, Watanabe, Naoki
Publikováno v:
ApJ 918 45 (2021)
It has been implicitly assumed that ices on grains in molecular clouds and proto planetary disks are formed by homogeneous layers regardless of their composition or crystallinity. To verify this assumption, we observed the H2O deposition onto refract
Externí odkaz:
http://arxiv.org/abs/2109.03404
Autor:
Tsuge, Masashi, Watanabe, Naoki
Because chemical reactions on/in cosmic ice dust grains covered by amorphous solid water (ASW) play important roles in generating a variety of molecules, many experimental and theoretical studies have focused on the chemical processes occurring on th
Externí odkaz:
http://arxiv.org/abs/2101.02813
Autor:
Tsuge, Masashi, Namiyoshi, Toshinobu, Furuya, Kenji, Yamazaki, Tomoya, Kouchi, Akira, Watanabe, Naoki
The H2 molecule has two nuclear spin isomers, the so-called ortho and para isomers. Nuclear spin conversion (NSC) between these states is forbidden in the gas phase. The energy difference between the lowest ortho and para states is as large as 14.7 m
Externí odkaz:
http://arxiv.org/abs/2101.02357
Publikováno v:
ApJ 900 187 (2020)
The surface processes on interstellar dust grains have an important role in the chemical evolution in molecular clouds. Hydrogenation reactions on ice surfaces have been extensively investigated and are known to proceed at low temperatures mostly bel
Externí odkaz:
http://arxiv.org/abs/2007.15782