【摘要】：凝聚相條件下,受分子間相互作用的影響,分子的解離機理通常不同于孤立分子.如何在凝聚相材料中有效地監(jiān)測分子反應的進程和產(chǎn)物是目前急需解決的一個技術(shù)難題.本文介紹了飛秒瞬態(tài)光柵光譜技術(shù)在凝聚相材料解離動力學研究中的應用.作為相干光譜技術(shù)的一種,瞬態(tài)光柵光譜的信號強度高、無背底,因此能夠有效地鑒別體系中的微量反應產(chǎn)物.通過對碘甲烷、硝基甲烷等模型體系的研究,驗證了瞬態(tài)光柵技術(shù)不僅能夠在時域上給出電子態(tài)的弛豫信息,還能夠在光譜上同時監(jiān)測反應物和產(chǎn)物以及分子或基團的振動.凝聚相條件下的解離動力學研究對于了解生化、爆炸等反應的機理有非常重要的意義,因此飛秒瞬態(tài)光柵技術(shù)在這方面具有廣闊的應用空間.此外,作為一種非接觸的診斷技術(shù),瞬態(tài)光柵很容易和高溫、高壓等條件結(jié)合,因此瞬態(tài)光柵技術(shù)在研究材料的相變動力學、高壓合成等方面也具有潛在的應用價值.
[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.
【作者單位】： 中國工程物理研究院流體物理研究所沖擊波與爆炸物理國防科技重點實驗室;山東省科學院激光研究所青島先進光子技術(shù)研究中心;
【基金】：國家自然科學基金(批準號:21673211,11404307,11304058) 國家自然科學基金委員會-中國工程物理研究院聯(lián)合基金(批準號:U1330106) 國防基礎科研與核科學挑戰(zhàn)計劃(批準號:JCKY2016212A501)資助的課題~~
【分類號】：O469

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