Ultrafast Imaging of Molecules with Electron Diffraction

被引:58
作者
Centurion, Martin [1 ]
Wolf, Thomas J. A. [2 ]
Yang, Jie [3 ]
机构
[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA
[2] SLAC Natl Accelerator Lab, Stanford Pulse Inst, Menlo Pk, CA USA
[3] Tsinghua Univ, Ctr Basic Mol Sci, Dept Chem, Beijing, Peoples R China
关键词
ultrafast electron diffraction; molecular imaging; structural dynamics; molecular dynamics; femtosecond dynamics; SCATTERING CROSS-SECTIONS; CONICAL INTERSECTION; DYNAMICS; INTENSITY;
D O I
10.1146/annurev-physchem-082720-010539
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photoexcited molecules convert light into chemical and mechanical energy through changes in electronic and nuclear structure that take place on femtosecond timescales. Gas phase ultrafast electron diffraction (GUED) is an ideal tool to probe the nuclear geometry evolution of the molecules and complements spectroscopic methods that are mostly sensitive to the electronic state. GUED is a weak and passive probing tool that does not alter the molecular properties during the probing process and is sensitive to the spatial distribution of charge in the molecule, including both electrons and nuclei. Improvements in temporal resolution have enabled GUED to capture coherent nuclear motions in molecules in the excited and ground electronic states with femtosecond and subangstrom resolution. Here we present the basic theory of GUED and explain what information is encoded in the diffraction signal, review how GUED has been used to observe coherent structural dynamics in recent experiments, and discuss the advantages and limitations of the method.
引用
收藏
页码:21 / 42
页数:22
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