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“Structural dynamics of water
using XFELs”
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Date: |
Download-files: |
Time: |
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Tuesday, 08 Sept 2020 |
Video-Recording for any system with MP4-support
- Video.mp4 (ca.241 Mb) |
13:00 – 13:45
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Speaker today: F. Perakis (Stockholm University)
Abstract:
In this talk, an overview is given of our
activities in probing water dynamics
using x-ray free electron lasers (XFELs).
Specifically is discussed how coherent
x-rays allow to capture translational
dynamics of water using X-ray Speckle
Visibility Spectroscopy (XSVS) [1] as well
as orientational dynamics using X-ray
Optical Kerr Effect (OKE) Spectroscopy
[2]. The results are compared to molecular
dynamics simulations which indicate the
presence of cage effects in supercooled
water as well as the existence of two
liquids, high- and low-density liquids
(HDL and LDL) with different
polarisability.
Finally, here is also given a perspective
of probing protein dynamics using these
techniques and open questions and
challenges ahead are discussed [3].
[1] Coherent X-rays reveal the influence
of cage effects on ultrafast water dynamics
F. Perakis, G. Camisasca, T.J. Lane, A.
Späh, K.T. Wikfeldt, J.A. Sellberg, F. Lehmkühler, H. Pathak, K.H. Kim, K.
Amann-Winkel, S. Schreck, S. Song, T. Sato, M. Sikorski, A. Eilert, T. McQueen,
H. Ogasawara, D. Nordlund, W. Roseker, J. Koralek, S. Nelson, P. Hart, R.
Alonso-Mori, Y. Feng, D. Zhu, A. Robert, G. Grübel, L.G.M. Pettersson, and A.
Nilsson,
Nat. Commun. 9, 1917 (2018).
https://www.nature.com/articles/s41467-018-04330-5
[2] Anisotropic X-Ray Scattering of
Transiently Oriented Water
K.H. Kim, A. Späh, H. Pathak, C. Yang, S.
Bonetti, K. Amann-Winkel, D. Mariedahl, D. Schlesinger, J.A. Sellberg, D.
Mendez, G. van der Schot, H.Y. Hwang, J. Clark, O. Shigeki, T. Tadashi, Y. Harada,
H. Ogasawara, T. Katayama, A. Nilsson, and F. Perakis,
Phys. Rev. Lett. 125, 076002 (2020).
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.076002
[3] Towards molecular movies with X-ray
photon correlation spectroscopy
F. Perakis and C. Gutt,
Phys. Chem. Chem. Phys, 22, 19443-19453
(2020).
https://doi.org/10.1039/D0CP03551C