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.

在某种程度上，我们的星球上产生生命的复杂化学汤的起源仍不清楚。然而，越来越清楚的是，至少有一部分化学复杂性源自近50亿年前我们的太阳系凝聚的致密分子云。复杂的有机分子已知是在星际尘埃颗粒冰冷的地幔中形成的，在如此密集的分子云的寒冷深处，可能是我们原始大气和海洋的种子。在这些寒冷、黑暗的区域，促进化学变化的唯一现实的能量来源是高能（>keV）粒子和光子辐射。这样的辐射会在冰冷的颗粒层内产生大量低能次级电子，它们才是化学变化的真正动因。本项目旨在采用定性和定量的表面科学技术和方法，研究在受控低能电子照射下由极其简单的前体冰混合物（如H2O/CO， H2O/NH3/CO等）形成复杂有机物的过程。反射-吸收红外光谱（RAIRS）、程序升温解吸（TPD）和微重方法将结合起来研究表面化学状态的演变，而气相产物将通过四极杆质谱（QMS）作为电子能量和束流的函数进行检测。

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