凝聚相材料分子解离动力学的飞秒瞬态光栅光谱研究
发布时间：2019-02-26 13:29
【摘要】：凝聚相条件下,受分子间相互作用的影响,分子的解离机理通常不同于孤立分子.如何在凝聚相材料中有效地监测分子反应的进程和产物是目前急需解决的一个技术难题.本文介绍了飞秒瞬态光栅光谱技术在凝聚相材料解离动力学研究中的应用.作为相干光谱技术的一种,瞬态光栅光谱的信号强度高、无背底,因此能够有效地鉴别体系中的微量反应产物.通过对碘甲烷、硝基甲烷等模型体系的研究,验证了瞬态光栅技术不仅能够在时域上给出电子态的弛豫信息,还能够在光谱上同时监测反应物和产物以及分子或基团的振动.凝聚相条件下的解离动力学研究对于了解生化、爆炸等反应的机理有非常重要的意义,因此飞秒瞬态光栅技术在这方面具有广阔的应用空间.此外,作为一种非接触的诊断技术,瞬态光栅很容易和高温、高压等条件结合,因此瞬态光栅技术在研究材料的相变动力学、高压合成等方面也具有潜在的应用价值.
[Abstract]:Under the condition of condensed phase, the dissociation mechanism of molecules is usually different from that of isolated molecules under the influence of intermolecular interaction. How to effectively monitor the process and product of molecular reaction in condensed phase materials is a technical problem which needs to be solved urgently at present. This paper introduces the application of femtosecond transient grating spectroscopy in the study of dissociation dynamics of condensed phase materials. As a kind of coherent spectrum technique, the transient grating spectrum has high signal intensity and no back bottom, so it can effectively identify the micro-reaction products in the system. The transient grating technique can not only give the relaxation information of electronic states in time domain, but also monitor the vibration of reactants and products as well as molecules or groups at the same time by studying the model systems such as iodine methane and nitromethane. The study of dissociation kinetics under the condition of condensed phase is very important for understanding the mechanism of biochemical and explosive reactions, so the femtosecond transient grating technique has a wide application space in this field. In addition, as a non-contact diagnostic technique, transient grating is easy to be combined with high temperature and high pressure conditions. Therefore, transient grating technology has potential application value in the study of phase transition dynamics and high pressure synthesis of materials.
【作者单位】： 中国工程物理研究院流体物理研究所冲击波与爆炸物理国防科技重点实验室;山东省科学院激光研究所青岛先进光子技术研究中心;
【基金】：国家自然科学基金(批准号:21673211,11404307,11304058) 国家自然科学基金委员会-中国工程物理研究院联合基金(批准号:U1330106) 国防基础科研与核科学挑战计划(批准号:JCKY2016212A501)资助的课题~~
【分类号】：O469
[Abstract]:Under the condition of condensed phase, the dissociation mechanism of molecules is usually different from that of isolated molecules under the influence of intermolecular interaction. How to effectively monitor the process and product of molecular reaction in condensed phase materials is a technical problem which needs to be solved urgently at present. This paper introduces the application of femtosecond transient grating spectroscopy in the study of dissociation dynamics of condensed phase materials. As a kind of coherent spectrum technique, the transient grating spectrum has high signal intensity and no back bottom, so it can effectively identify the micro-reaction products in the system. The transient grating technique can not only give the relaxation information of electronic states in time domain, but also monitor the vibration of reactants and products as well as molecules or groups at the same time by studying the model systems such as iodine methane and nitromethane. The study of dissociation kinetics under the condition of condensed phase is very important for understanding the mechanism of biochemical and explosive reactions, so the femtosecond transient grating technique has a wide application space in this field. In addition, as a non-contact diagnostic technique, transient grating is easy to be combined with high temperature and high pressure conditions. Therefore, transient grating technology has potential application value in the study of phase transition dynamics and high pressure synthesis of materials.
【作者单位】： 中国工程物理研究院流体物理研究所冲击波与爆炸物理国防科技重点实验室;山东省科学院激光研究所青岛先进光子技术研究中心;
【基金】：国家自然科学基金(批准号:21673211,11404307,11304058) 国家自然科学基金委员会-中国工程物理研究院联合基金(批准号:U1330106) 国防基础科研与核科学挑战计划(批准号:JCKY2016212A501)资助的课题~~
【分类号】：O469
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