关键词: 飞秒瞬态光栅/
分子反应动力学/
碘甲烷/
硝基甲烷
English Abstract
Photodissociation dynamics of organic molecules in condensed phase by femtosecond transient grating spectroscopy
Wu Hong-Lin1,Song Yun-Fei1,
Wang Yang2,
Yu Guo-Yang1,
Yang Yan-Qiang1
1.National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Chengdu 610200, China;
2.Qingdao Research Center for Advanced Photonic Technologies, Laser Institute of Shandong Academy of Sciences, Qingdao 266000, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 21673211, 11404307, 11304058), the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Grant No. U1330106), and the National Defense Basic Scientific Research and Nuclear Science Challenging Program of China (Grant No. JCKY2016212A501).Received Date:09 November 2016
Accepted Date:06 December 2016
Published Online:05 February 2017
Abstract:In condensed phase, the dissociation mechanism of molecule is different from that of isolated molecule due to the effect of interaction between molecules. How to effectively trace the reaction process and products in condensed phase is a technical problem which needs to be solved urgently. In this paper, femtosecond transient grating spectroscopy is used to investigate dissociation dynamics in condensed phase. Transient grating spectroscopy, as a coherent spectral technique, has some advantages such as high signal-noise ratio and free background, thus it can identify trace numbers of reaction products in dissociation. The investigation about model molecules such as iodomethane and nitromethane demonstrates that the transient grating technique can observe relaxation in electronic excited state and also has ability to track reactants, products, and vibration of molecule or perssad. The dissociation dynamics in condensed phase material is significant for understanding the reaction mechanism in the fields of biochemistry and detonation. Thus the femtosecond transient grating has a wide application prospect in these fields. In addition, the transient grating technique, as a non-contact diagnostic approach, can be easily adapted to high temperature and high pressure conditions, etc. Thus, the transient grating technique also has a potential value in the fields of phase transform dynamics and high pressure synthesis, etc.
Keywords: femtosecond transient grating/
molecular reaction dynamics/
iodomethane/
nitromethane
