Highly selective cryogenic reactions in solid hydrogen on pseudo cosmic dust surface

拟宇宙尘埃表面固态氢的高选择性低温反应

• 批准号: 23600005
• 负责人: KUMAGAI Jun
• 金额: $ 3.41万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23600005/
• 关键词: solid parahydrogen; radical-radical reaction; cosmic dust; tunneling; distortion of lattice; ionizing radiation; electron spin resonance; ラジカル―ラジカル反応; 原子トンネル反応; 疑似星間塵; トンネル拡散; H原子; パラ水素; 極低温反応; H6+水素分子イオン; Vacancy; 量子拡散; 高選択的ラジカル-ラジカル反応 /

As a model of cosmic dust for bio-molecular growth in dark nebula at cryogenic temperature, a mixture of silica gel with solid parahydrogen was used for deterring the reactions of H atoms and other radicals at 4.2 K. We found that H atoms and methyl radicals never react in solid parahydrogen even though H atoms were diffused in solid parahydrogen. H atoms also did not react with TEMPO radicals adsorbed on the silica gels. H atoms can diffuse in solid parahydrogen only by tunneling reaction of H abstraction reaction. Solute molecules as methyl radicals or silica gels may distort the lattice structure of solid parahydrogen, to make difficult for diffusion of H atoms by the tunneling. This can be the main reason why such radical-radical reactions could not take place at 4.2 K.

As a model of cosmic dust for bio-molecular growth in dark nebula at cryogenic temperature, a mixture of silica gel with solid parahydrogen was used for deterring the reactions of H atoms and other radicals at 4.2 K. We found that H atoms and methyl radicals never react in solid parahydrogen even though H atoms were diffused in solid parahydrogen. H原子也没有与吸附在二氧化硅凝胶上的节奏自由基反应。 H原子只能通过h原子反应的隧道反应来扩散固体寄生虫。 溶质分子作为甲基自由基或二氧化硅凝胶可能会扭曲固体寄生虫的晶格结构，从而难以通过隧道来扩散H原子。这可能是为什么在4.2 k处进行这种激进的激进反应的主要原因。