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Your search keyword '"Christopher J. Milne"' showing total 5 results
Start Over Author "Christopher J. Milne" Journal nature communications
5 results on '"Christopher J. Milne"'

1. Femtosecond X-ray emission study of the spin cross-over dynamics in haem proteins

Author

Dominik Kinschel, Camila Bacellar, Oliviero Cannelli, Boris Sorokin, Tetsuo Katayama, Giulia F. Mancini, Jérémy R. Rouxel, Yuki Obara, Junichi Nishitani, Hironori Ito, Terumasa Ito, Naoya Kurahashi, Chika Higashimura, Shotaro Kudo, Theo Keane, Frederico A. Lima, Wojciech Gawelda, Peter Zalden, Sebastian Schulz, James M. Budarz, Dmitry Khakhulin, Andreas Galler, Christian Bressler, Christopher J. Milne, Thomas Penfold, Makina Yabashi, Toshinori Suzuki, Kazuhiko Misawa, and Majed Chergui

Subjects
Science
Abstract

The change from low-spin hexacoordinated to high-spin pentacoordinated domed form in heam upon ligand detachment and the reverse process underlie the respiratory function. The authors, using femtosecond time-resolved X-ray emission spectroscopy, capture the transient states connecting the two forms in myoglobin-NO upon NO photoinduced detachment.

Published
2020
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2. Taking a snapshot of the triplet excited state of an OLED organometallic luminophore using X-rays

Author

Grigory Smolentsev, Christopher J. Milne, Alexander Guda, Kristoffer Haldrup, Jakub Szlachetko, Nicolo Azzaroli, Claudio Cirelli, Gregor Knopp, Rok Bohinc, Samuel Menzi, Georgios Pamfilidis, Dardan Gashi, Martin Beck, Aldo Mozzanica, Daniel James, Camila Bacellar, Giulia F. Mancini, Andrei Tereshchenko, Victor Shapovalov, Wojciech M. Kwiatek, Joanna Czapla-Masztafiak, Andrea Cannizzo, Michela Gazzetto, Mathias Sander, Matteo Levantino, Victoria Kabanova, Elena Rychagova, Sergey Ketkov, Marian Olaru, Jens Beckmann, and Matthias Vogt

Subjects
Science
Abstract

OLED materials based on thermally activated delayed fluorescence have promising efficiency. Here, the authors investigate an organometallic multicore Cu complex as luminophore, by pump-probe X-ray techniques at three different facilities deriving a complete picture of the charge transfer in the triplet excited state.

Published
2020
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3. Tracking multiple components of a nuclear wavepacket in photoexcited Cu(I)-phenanthroline complex using ultrafast X-ray spectroscopy

Author

Tetsuo Katayama, Thomas Northey, Wojciech Gawelda, Christopher J. Milne, György Vankó, Frederico A. Lima, Rok Bohinc, Zoltán Németh, Shunsuke Nozawa, Tokushi Sato, Dmitry Khakhulin, Jakub Szlachetko, Tadashi Togashi, Shigeki Owada, Shin-ichi Adachi, Christian Bressler, Makina Yabashi, and Thomas J. Penfold

Subjects
Science
Abstract

Nonadiabatic excited state processes involve mixing of electronic and nuclear wavefunctions, which are difficult to disentangle. Here the authors explore by time-resolved X-ray absorption near edge structure the wavepacket dynamics of a copper(I)-phenanthroline complex, resolving different vibrational modes.

Published
2019
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4. Revealing hole trapping in zinc oxide nanoparticles by time-resolved X-ray spectroscopy

Author

Thomas J. Penfold, Jakub Szlachetko, Fabio G. Santomauro, Alexander Britz, Wojciech Gawelda, Gilles Doumy, Anne Marie March, Stephen H. Southworth, Jochen Rittmann, Rafael Abela, Majed Chergui, and Christopher J. Milne

Subjects
Science
Abstract

Metal-oxide nanostructures are used in a range of light-driven applications, yet the fundamentals behind their properties are poorly understood. Here the authors probe photoexcited zinc oxide nanoparticles using time-resolved X-ray spectroscopy, identifying photocatalytically-active hole traps as oxygen vacancies in the lattice.

Published
2018
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5. Core-level nonlinear spectroscopy triggered by stochastic X-ray pulses

Author

Rafael Abela, Rolf Follath, Marcus Lundberg, Jens Rehanek, Christopher J. Milne, Wojciech Błachucki, Jakub Szlachetko, Krzysztof Tyrała, Joanna Czapla-Masztafiak, Yves Kayser, Mickaël G. Delcey, Roberto Alonso-Mori, Leonardo Sala, Jacinto Sá, Gregor Knopp, Pavle Juranić, Diling Zhu, and Matjaž Kavčič

Subjects
Science, Astrophysics::High Energy Astrophysical Phenomena, Ecology (disciplines), General Physics and Astronomy, Nonlinear spectroscopy, 02 engineering and technology, Physical Chemistry, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, X-rays, 0103 physical sciences, Statistical physics, lcsh:Science, 010306 general physics, Fysikalisk kemi, Multidisciplinary, Stochastic process, Atomic and molecular interactions with photons, General Chemistry, 021001 nanoscience & nanotechnology, Fundamental physics, Core level, lcsh:Q, 0210 nano-technology
Abstract

Stochastic processes are highly relevant in research fields as different as neuroscience, economy, ecology, chemistry, and fundamental physics. However, due to their intrinsic unpredictability, stochastic mechanisms are very challenging for any kind of investigations and practical applications. Here we report the deliberate use of stochastic X-ray pulses in two-dimensional spectroscopy to the simultaneous mapping of unoccupied and occupied electronic states of atoms in a regime where the opacity and transparency properties of matter are subject to the incident intensity and photon energy. A readily transferable matrix formalism is presented to extract the electronic states from a dataset measured with the monitored input from a stochastic excitation source. The presented formalism enables investigations of the response of the electronic structure to irradiation with intense X-ray pulses while the time structure of the incident pulses is preserved., Free electron X-ray laser pulses, generated by self-amplified spontaneous emission, are stochastic in nature. Here the authors present a reconstruction method for 2D spectroscopy while preserving the intrinsic properties of the incident pulses and apply it to a study towards X-ray intensity induced effects.

Published
2019

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