Sub-7-femtosecond conical-intersection dynamics probed at the carbon K-edge

doi:10.1126/science.abf1656

GSTDTAP > 气候变化

DOI	10.1126/science.abf1656
	Sub-7-femtosecond conical-intersection dynamics probed at the carbon K-edge
	Kristina S. Zinchenko; Fernando Ardana-Lamas; Issaka Seidu; Simon P. Neville; Joscelyn van der Veen; Valentina Utrio Lanfaloni; Michael S. Schuurman; Hans Jakob Wörner
	2021-01-29
发表期刊	Science
出版年	2021
英文摘要	Technical advances in extending spectroscopy to the attosecond time scale has caused considerable interest in experimental studies of various ultrafast processes that were previously inaccessible. Using attosecond transient absorption around the carbon K-edge accompanied by ab initio quantum dynamics simulations, Zinchenko et al. investigated ultrafast, non-adiabatic dynamics in the ethylene cation. They directly observed the electronic D1 → D relaxation mediated by the conical intersection taking place within 7 femtoseconds, far shorter than any vibrational period or any previously reported electronic relaxation. The demonstrated technique is directly applicable to liquids and solutions, enabling further studies of charge- and energy-transfer dynamics of organic molecules in chemical and biochemical systems. Science , this issue p. [489][1] Conical intersections allow electronically excited molecules to return to their electronic ground state. Here, we observe the fastest electronic relaxation dynamics measured to date by extending attosecond transient-absorption spectroscopy (ATAS) to the carbon K-edge. We selectively launch wave packets in the two lowest electronic states (D and D1) of C2H4+. The electronic D1 → D relaxation takes place with a short time constant of 6.8 ± 0.2 femtoseconds. The electronic-state switching is directly visualized in ATAS owing to a spectral separation of the D1 and D bands caused by electron correlation. Multidimensional structural dynamics of the molecule are simultaneously observed. Our results demonstrate the capability to resolve the fastest electronic and structural dynamics in the broad class of organic molecules. They show that electronic relaxation in the prototypical organic chromophore can take place within less than a single vibrational period. [1]: /lookup/doi/10.1126/science.abf1656
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314012
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Kristina S. Zinchenko,Fernando Ardana-Lamas,Issaka Seidu,et al. Sub-7-femtosecond conical-intersection dynamics probed at the carbon K-edge[J]. Science,2021.
APA	Kristina S. Zinchenko.,Fernando Ardana-Lamas.,Issaka Seidu.,Simon P. Neville.,Joscelyn van der Veen.,...&Hans Jakob Wörner.(2021).Sub-7-femtosecond conical-intersection dynamics probed at the carbon K-edge.Science.
MLA	Kristina S. Zinchenko,et al."Sub-7-femtosecond conical-intersection dynamics probed at the carbon K-edge".Science (2021).