Using coherent X-rays to follow dynamics in amorphous ices.

Autor:	Ladd-Parada M; Department of Physics, Stockholm University Roslagstullsbacken 21 10691 Stockholm Sweden amannk@mpip-mainz.mpg.de., Li H; Department of Physics, Stockholm University Roslagstullsbacken 21 10691 Stockholm Sweden amannk@mpip-mainz.mpg.de.; Max-Planck-Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany., Karina A; Department of Physics, Stockholm University Roslagstullsbacken 21 10691 Stockholm Sweden amannk@mpip-mainz.mpg.de., Kim KH; Department of Chemistry POSTECH Pohang 37673 Republic of Korea., Perakis F; Department of Physics, Stockholm University Roslagstullsbacken 21 10691 Stockholm Sweden amannk@mpip-mainz.mpg.de., Reiser M; Department of Physics, Stockholm University Roslagstullsbacken 21 10691 Stockholm Sweden amannk@mpip-mainz.mpg.de., Dallari F; Deutsches Elektronen-Synchrotron DESY Notkestr. 85 22607 Hamburg Germany., Striker N; Deutsches Elektronen-Synchrotron DESY Notkestr. 85 22607 Hamburg Germany., Sprung M; Deutsches Elektronen-Synchrotron DESY Notkestr. 85 22607 Hamburg Germany., Westermeier F; Deutsches Elektronen-Synchrotron DESY Notkestr. 85 22607 Hamburg Germany., Grübel G; Deutsches Elektronen-Synchrotron DESY Notkestr. 85 22607 Hamburg Germany.; Hamburg Centre for Ultrafast Imaging Luruper Chaussee 149 22761 Hamburg Germany., Nilsson A; Department of Physics, Stockholm University Roslagstullsbacken 21 10691 Stockholm Sweden amannk@mpip-mainz.mpg.de., Lehmkühler F; Deutsches Elektronen-Synchrotron DESY Notkestr. 85 22607 Hamburg Germany.; Hamburg Centre for Ultrafast Imaging Luruper Chaussee 149 22761 Hamburg Germany., Amann-Winkel K; Department of Physics, Stockholm University Roslagstullsbacken 21 10691 Stockholm Sweden amannk@mpip-mainz.mpg.de.; Max-Planck-Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany.; Institute of Physics, Johannes Gutenberg University Mainz Staudingerweg 7 55128 Mainz Germany.
Jazyk:	angličtina
Zdroj:	Environmental science: atmospheres [Environ Sci Atmos] 2022 Sep 13; Vol. 2 (6), pp. 1314-1323. Date of Electronic Publication: 2022 Sep 13 (Print Publication: 2022).
DOI:	10.1039/d2ea00052k
Abstrakt:	Amorphous solid water plays an important role in our overall understanding of water's phase diagram. X-ray scattering is an important tool for characterising the different states of water, and modern storage ring and XFEL facilities have opened up new pathways to simultaneously study structure and dynamics. Here, X-ray photon correlation spectroscopy (XPCS) was used to study the dynamics of high-density amorphous (HDA) ice upon heating. We follow the structural transition from HDA to low-density amorphous (LDA) ice, by using wide-angle X-ray scattering (WAXS), for different heating rates. We used a new type of sample preparation, which allowed us to study μm-sized ice layers rather than powdered bulk samples. The study focuses on the non-equilibrium dynamics during fast heating, spontaneous transformation and crystallization. Performing the XPCS study at ultra-small angle (USAXS) geometry allows us to characterize the transition dynamics at length scales ranging from 60 nm-800 nm. For the HDA-LDA transition we observe a clear separation in three dynamical regimes, which show different dynamical crossovers at different length scales. The crystallization from LDA, instead, is observed to appear homogenously throughout the studied length scales. Competing Interests: The authors declare no competing financial interest. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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