T
Tuomas Pylkkänen
Researcher at University of Helsinki
Publications - 20
Citations - 869
Tuomas Pylkkänen is an academic researcher from University of Helsinki. The author has contributed to research in topics: Spectroscopy & Inelastic scattering. The author has an hindex of 16, co-authored 20 publications receiving 783 citations. Previous affiliations of Tuomas Pylkkänen include European Synchrotron Radiation Facility.
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Journal ArticleDOI
Microscopic structure of water at elevated pressures and temperatures
Christoph J. Sahle,Christian Sternemann,Christian Schmidt,Susi Lehtola,Sandro Jahn,Laura Simonelli,Simo Huotari,Mikko Hakala,Tuomas Pylkkänen,Alexander Nyrow,Kolja Mende,Metin Tolan,Keijo Hämäläinen,Max Wilke +13 more
TL;DR: According to the simulations, distortions of the hydrogen-bond network increase dramatically when temperature and pressure increase to the supercritical regime and the average number of hydrogen bonds per molecule decreases.
Journal ArticleDOI
Multiple-element spectrometer for non-resonant inelastic X-ray spectroscopy of electronic excitations
Roberto Verbeni,Tuomas Pylkkänen,Tuomas Pylkkänen,Simo Huotari,Laura Simonelli,György Vankó,Keith Martel,C. Henriquet,Giulio Monaco +8 more
TL;DR: A multiple-analyser-crystal spectrometer for non-resonant inelastic X-ray scattering spectroscopy installed at beamline ID16 of the European Synchrotron Radiation Facility is presented.
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Direct tomography with chemical-bond contrast
Simo Huotari,Simo Huotari,Tuomas Pylkkänen,Tuomas Pylkkänen,Roberto Verbeni,Giulio Monaco,Keijo Hämäläinen +6 more
TL;DR: This work introduces a new hard-X-ray spectroscopic tomography with a unique sensitivity to light elements, and applies the method to acquire the 3D structure and map the chemical bonding in selected samples relevant to materials science.
Journal ArticleDOI
Pressure induced magnetic transition in siderite FeCO3 studied by x-ray emission spectroscopy
A. Mattila,Tuomas Pylkkänen,Tuomas Pylkkänen,Jean-Pascal Rueff,Simo Huotari,György Vankó,Michael Hanfland,Martti Lehtinen,Keijo Hämäläinen +8 more
TL;DR: In this article, the magnetic state of iron in siderite FeCO3 under high pressure using Kβ x-ray emission spectroscopy was investigated and it was shown that the ground state changes from a low pressure magnetic state to a high pressure non-magnetic state roughly at 50 GPa.
Journal ArticleDOI
Momentum Distribution and Renormalization Factor in Sodium and the Electron Gas
Simo Huotari,J. Aleksi Soininen,Tuomas Pylkkänen,Tuomas Pylkkänen,Keijo Hämäläinen,Arezki Issolah,Andrey Titov,Jeremy McMinis,Jeongnim Kim,Ken Esler,David M. Ceperley,Markus Holzmann,Valerio Olevano +12 more
TL;DR: From an x-ray Compton-profile measurement of the valence-electron-momentum density, an accurate measure of the renormalization factor is derived that is compared with quantum Monte Carlo and G0W0 calculations performed both on crystalline sodium and on the homogeneous electron gas.