Probing The Origins Of Chemical Complexity

探究化学复杂性的起源

• 批准号: GR/T27044/02
• 负责人: Martin McCoustra
• 金额: --
• 依托单位: Heriot-Watt University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=GR%2FT27044%2F02
• 关键词: Probing; Origins; Chemical; Complexity

The origins of the complex chemical soup from which life arose on our planet remain to some extent clouded. However, it has become increasingly clear that at least some of that chemical complexity originated from the dense molecular cloud from which our solar system condensed nearly 5 billion years ago. Complex organic molecules are known to be formed in the icy mantles of interstellar dust grains in the cold depths of such dense molecular clouds and may have seeded our primordial atmosphere and oceans. In these cold, dark regions, the only realistic energy source for promotion of chemical change is high energy (>keV) particle and photon radiation. Such radiation generates within the icy grain mantles a shower of low energy secondary electrons that are the true agents of chemical change. This programme seeks to appy both qualitative and quantitative surface science techniques and methodolgies to investigate the formation of complex organics from extremely simple precursor ice mixtures, e.g. H2O/CO, H2O/NH3/CO etc. under controlled low energy electron irradiation. Reflection-absorption infrared spectroscopy (RAIRS), temperature programmed desorption (TPD) and micrgravimetric methods will be combined to investigate the evolution of the surface chemical state while gas phase products will be detected by quadrupole mass spectrometry (QMS) as a function of both electron energy and beam current.

生命从我们地球上产生的复杂化学汤的起源在某种程度上仍然笼罩着。但是，已经越来越清楚的是，至少某些化学复杂性源自我们的太阳系在近50亿年前凝结的密集分子云。已知复杂的有机分子在这种密集的分子云的冷深度中形成在星际粉尘粒的冰雪披覆中，可能已经播种了我们原始的大气和海洋。在这些寒冷的黑暗区域中，促进化学变化的唯一现实能源是高能量（> keV）和光子辐射。这种辐射在冰谷物披风中产生一个低能二级电子的淋浴，这些电子是化学变化的真实药物。该计划旨在既有定性和定量的表面科学技术和方法，以研究从极其简单的前体冰混合物中的复杂有机物的形成，例如H2O/CO，H2O/NH3/CO等在受控的低能电子照射下。将组合吸收反射 - 吸收红外光谱（RAIRS），温度编程的解吸（TPD）和微量学方法，以研究表面化学状态的演变，而四倍体质谱法（QMS）将作为电子能量和束电流的功能检测到气相产物。

项目成果

Assigning a structural motif using spontaneous molecular dipole orientation in thin films.

使用薄膜中的自发分子偶极子取向分配结构基序。

• DOI: 10.1039/c8cp06010j
• 发表时间: 2018
• 期刊: PCCP
• 作者: Roman M

Electron-Promoted Desorption from Water Ice Surfaces: Neutral Gas-Phase Products

水冰表面的电子促进解吸：中性气相产物

• DOI: 10.1021/acsearthspacechem.7b00028
• 发表时间: 2017
• 期刊: ACS Earth and Space Chemistry
• 影响因子: 3.4
• 作者: Abdulgalil A