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皮秒时间分辨 XAFS 直接探测与电子和结构修饰耦合的自旋态动力学。

Direct probing of spin state dynamics coupled with electronic and structural modifications by picosecond time-resolved XAFS.

机构信息

ERATO, Japan Science and Technology Agency, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.

出版信息

J Am Chem Soc. 2010 Jan 13;132(1):61-3. doi: 10.1021/ja907460b.

DOI:10.1021/ja907460b
PMID:20014844
Abstract

The first direct observation of the transient spin-state in a disordered magnetic system with time-resolved XAFS is reported. By observing the evolution of the Fe(II) 1s-3d transition, the spin crossover transition from the (1)A(1) low spin state to (5)T(2) high spin state has been directly observed on a picosecond time scale. Moreover, observation of the transient spin state with time-resolved XAFS allows for the investigation of the variations in the electronic state and molecular structure. This unique experimental technique probes the excited states involved in the ultrafast photoinduced reactions in disordered magnetic systems.

摘要

首次通过时间分辨 XAFS 直接观察到无序磁系统中瞬态自旋态。通过观察 Fe(II) 1s-3d 跃迁的演化，我们在皮秒时间尺度上直接观察到了从低自旋 (1)A(1)态到高自旋 (5)T(2)态的自旋交叉转变。此外，通过时间分辨 XAFS 观察瞬态自旋态，可以研究电子态和分子结构的变化。这种独特的实验技术探测了无序磁系统中超快光致反应中涉及的激发态。

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