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.

我们星球上孕育生命的复杂化学汤的起源在某种程度上仍然扑朔迷离。然而，越来越清楚的是，至少部分化学复杂性源自近 50 亿年前太阳系凝结而成的致密分子云。众所周知，复杂的有机分子是在如此致密的分子云的寒冷深处的星际尘埃颗粒的冰冷地幔中形成的，并且可能为我们的原始大气和海洋播下了种子。在这些寒冷、黑暗的区域，促进化学变化的唯一现实能源是高能（>keV）粒子和光子辐射。这种辐射在冰晶颗粒地幔内产生大量低能二次电子，它们是化学变化的真正媒介。该计划旨在应用定性和定量表面科学技术和方法来研究从极其简单的前体冰混合物（例如冰）中形成复杂有机物。受控低能电子辐照下的H2O/CO、H2O/NH3/CO等。反射吸收红外光谱 (RAIRS)、程序升温解吸 (TPD) 和微重力方法将结合起来研究表面化学态的演变，而气相产物将通过四极杆质谱 (QMS) 检测作为电子能量和束流的函数。

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