气候变化领域集成服务门户(CCPortal): Dynamics of chemical bonding mapped by energy-resolved 4D electron microscopy

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DOI	10.1126/science.1175005
	Dynamics of chemical bonding mapped by energy-resolved 4D electron microscopy
	Carbone F.; Kwon O.-H.; Zewail A.H.
发表日期	2009
ISSN	0036-8075
起始页码	181
结束页码	184
卷号	325 期号:5937
英文摘要	Chemical bonding dynamics are fundamental to the understanding of properties and behavior of materials and molecules. Here, we demonstrate the potential of time-resolved, femtosecond electron energy loss spectroscopy (EELS) for mapping electronic structural changes in the course of nuclear motions. For graphite, it is found that changes of milli - electron volts in the energy range of up to 50 electron volts reveal the compression and expansion of layers on the subpicometer scale (for surface and bulk atoms). These nonequilibrium structural features are correlated with the direction of change from sp 2 [two-dimensional (2D) graphene] to sp3 (3D-diamond) electronic hybridization, and the results are compared with theoretical charge-density calculations. The reported femtosecond time resolution of four-dimensional (4D) electron microscopy represents an advance of 10 orders of magnitude over that of conventional EELS methods.
英文关键词	graphite; chemical bonding; electron microscopy; graphite; article; atom; calculation; chemical binding; chemical structure; electron energy loss spectroscopy; electron microscopy; electronics; energy transfer; four dimensional electron microscopy; image quality; intermethod comparison; molecular dynamics; optical resolution; priority journal; subpicometer; surface property; Crystallization; Graphite; Lasers; Microscopy, Energy-Filtering Transmission Electron; Physicochemical Processes; Spectroscopy, Electron Energy-Loss
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243236
作者单位	Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, United States; Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne-Dorigny, Switzerland
推荐引用方式 GB/T 7714	Carbone F.,Kwon O.-H.,Zewail A.H.. Dynamics of chemical bonding mapped by energy-resolved 4D electron microscopy[J],2009,325(5937).
APA	Carbone F.,Kwon O.-H.,&Zewail A.H..(2009).Dynamics of chemical bonding mapped by energy-resolved 4D electron microscopy.Science,325(5937).
MLA	Carbone F.,et al."Dynamics of chemical bonding mapped by energy-resolved 4D electron microscopy".Science 325.5937(2009).