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Rotational dephasing of a gold complex probed by anisotropic femtosecond x-raysolution scattering using an x-ray free-electron laser

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Title
Rotational dephasing of a gold complex probed by anisotropic femtosecond x-raysolution scattering using an x-ray free-electron laser
Author(s)
Jong Goo Kim; Kyung Hwan Kim; Key Young Oang; Tae Wu Kim; Hosung Ki; Junbeom Jo; Jeongho Kim; Tokushi Sato; Shunsuke Nozawa; Shin-ichi Adachi; Hyotcherl Ihee
Subject
anisotropic x-ray solution scattering, rotational dephasing, XFEL
Publication Date
2015-12
Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, v.48, no.24, pp.244005
Publisher
IOP PUBLISHING LTD
Abstract
The orientational dynamics of a gold trimer complex in a solution are investigated by using anisotropic femtosecond x-ray solution scattering measured by an x-ray free-electron laser. A linearly polarized laser pulse preferentially excites molecules with transition dipoles oriented parallel to the laser polarization, leading to the transient alignment of excited molecules. Such photoselectively aligned molecules give rise to an anisotropic scattering pattern that has different profiles in parallel and perpendicular directions with respect to laser polarization. Anisotropic x-ray scattering patterns obtained from the transiently aligned molecules contain information on the molecular orientation. By monitoring the time evolution of the anisotropic scattering pattern, we probe the rotational dephasing dynamics of [Au(CN)2 −]3 in a solution. We found that rotational dephasing of [Au(CN)2 −]3 occurs with a time constant of 13±4 ps. By contrast, time-resolved scattering data on FeCl3 in a water solution, which does not accompany any structural change and gives only the contributions of solvent heating, lacks any anisotropy in the scattering signal. © 2015 IOP Publishing Ltd
URI
https://pr.ibs.re.kr/handle/8788114/2279
DOI
10.1088/0953-4075/48/24/244005
ISSN
0953-4075
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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