Tracing orbital images on ultrafast time scales

doi:10.1126/science.abf3286

GSTDTAP > 气候变化

DOI	10.1126/science.abf3286
	Tracing orbital images on ultrafast time scales
	R. Wallauer; M. Raths; K. Stallberg; L. Münster; D. Brandstetter; X. Yang; J. Güdde; P. Puschnig; S. Soubatch; C. Kumpf; F. C. Bocquet; F. S. Tautz; U. Höfer
	2021-03-05
发表期刊	Science
出版年	2021
英文摘要	Following molecular excitation and electron transfer processes in time and space within a single experiment is a long-standing goal of spectroscopy in the field of chemistry. Wallauer et al. combined tomographic photoemission imaging with a femtosecond pump-probe scheme to trace the excited state molecular orbitals of surface-adsorbed molecules with both spatial and temporal resolution. The present demonstration opens a new window for investigating the ultrafast electron transfer dynamics in such processes as chemical reactions on surfaces and intermolecular charge transfers. Science , this issue p. [1056][1] Frontier orbitals determine fundamental molecular properties such as chemical reactivities. Although electron distributions of occupied orbitals can be imaged in momentum space by photoemission tomography, it has so far been impossible to follow the momentum-space dynamics of a molecular orbital in time, for example, through an excitation or a chemical reaction. Here, we combined time-resolved photoemission using high laser harmonics and a momentum microscope to establish a tomographic, femtosecond pump-probe experiment of unoccupied molecular orbitals. We measured the full momentum-space distribution of transiently excited electrons, connecting their excited-state dynamics to real-space excitation pathways. Because in molecules this distribution is closely linked to orbital shapes, our experiment may, in the future, offer the possibility of observing ultrafast electron motion in time and space. [1]: /lookup/doi/10.1126/science.abf3286
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/317005
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	R. Wallauer,M. Raths,K. Stallberg,et al. Tracing orbital images on ultrafast time scales[J]. Science,2021.
APA	R. Wallauer.,M. Raths.,K. Stallberg.,L. Münster.,D. Brandstetter.,...&U. Höfer.(2021).Tracing orbital images on ultrafast time scales.Science.
MLA	R. Wallauer,et al."Tracing orbital images on ultrafast time scales".Science (2021).