Thomas Meier

Shanghai Advanced Research Institute

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Leonid Dubrovinsky

University of Bayreuth

Saiana Khandarkhaeva

University of Bayreuth

Florian Trybel

Linköping University

Dominique Laniel

University of Edinburgh

Natalia Dubrovinskaia

University of Bayreuth

Alena Aslandukovа

University of Bayreuth

Sylvain Petitgirard

ETH Zurich

Gerd Steinle‐Neumann

University of Bayreuth

Takayuki Ishii

Zeria Pharmaceutical (Japan)

Jürgen Haase

Leipzig University

Cooperative Institutions

Center for High Pressure Science and Technology Advanced Research

University of Bayreuth

Chinese Academy of Sciences

Center for High Pressure Science & Technology Advanced Research

Carnegie Institution for Science

University of Chinese Academy of Sciences

Bayer (Germany)

Centre National de la Recherche Scientifique

Deutsches Elektronen-Synchrotron DESY

Bayerisches Landesamt für Umwelt

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An experimental study of the influence of uniaxial load on flame jet drilling

International Journal of Rock Mechanics and Mining Sciences (2018)

Dragana Höser Thomas Meier Alexandra Pătru Michael A. Kant Ph. Rudolf von Rohr

Uniaxial tension

10.1016/j.ijrmms.2018.04.007

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Citations (10)

Multi-component time, spatial and frequency analysis of Paleoclimatic Data

EGU General Assembly Conference Abstracts (2017)

Luigia Cristiano Johannes Stampa Ingo Feeser Walter Dörfler Thomas Meier

Component (thermodynamics)

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Asthenospheric Flow and Origin of Volcanism in the Baikal Rift Area

AGUFM (2007)

Sergei Lebedev Thomas Meier R. D. van der Hilst

Rift zone

Volcanology

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Magnetic flux tailoring through Lenz lenses for ultrasmall samples: A new pathway to high-pressure nuclear magnetic resonance

Science Advances (2017)

Thomas Meier Nan Wang Dario Mager Jan G. Korvink Sylvain Petitgirard

A new pathway to nuclear magnetic resonance (NMR) spectroscopy for picoliter-sized samples (including those kept in harsh and extreme environments, particularly in diamond anvil cells) is introduced, using inductively coupled broadband passive electromagnetic lenses, to locally amplify the magnetic field at the isolated sample, leading to an increase in sensitivity. The lenses are adopted for the geometrical restrictions imposed by a toroidal diamond indenter cell and yield signal-to-noise ratios at pressures as high as 72 GPa at initial sample volumes of only 230 pl. The corresponding levels of detection are found to be up to four orders of magnitude lower compared to formerly used solenoidal microcoils. Two-dimensional nutation experiments on long-chained alkanes, CnH2n+2 (n = 16 to 24), as well as homonuclear correlation spectroscopy on thymine, C5H6N2O2, were used to demonstrate the feasibility of this approach for higher-dimensional NMR experiments, with a spectral resolution of at least 2 parts per million. This approach opens up the field of ultrahigh-pressure sciences to one of the most versatile spectroscopic methods available in a pressure range unprecedented up to now.

Diamond anvil cell

10.1126/sciadv.aao5242

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Citations (47)

Magnetic Flux Tailoring through Lenz Lenses in Toroidal Diamond Indenter Cells: A New Pathway to High Pressure Nuclear Magnetic Resonance

arXiv (Cornell University) (2017)

Thomas Meier Nan Wang Dario Mager Jan G. Korvink Sylvain Petigirard

A new pathway to nuclear magnetic resonance spectroscopy in high pressure diamond anvil cells is introduced, using inductively coupled broadband passive electro-magnetic lenses to locally amplify the magnetic flux at the isolated sample, leading to an increase in sensitivity. The lenses are adopted for the geometrical restrictions imposed by a toroidal diamond indenter cell, and yield high signal-to-noise ratios at pressures as high as 72 GPa, at initial sample volumes of only 230 pl. The corresponding levels of detection, LODt, are found to be up to four orders of magnitude lower compared to formerly used solenoidal micro-coils in diamond anvil cells, as shown by Proton-NMR measurements on paraffin oil. This approach opens up the field of ultra-high pressure sciences for one of the most versatile spectroscopic methods available in a pressure range unprecedended up to now.

10.48550/arxiv.1706.00073

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Citations (11)

Structural independence of hydrogen-bond symmetrisation dynamics at extreme pressure conditions

Nature Communications (2022)

Thomas Meier Florian Trybel Saiana Khandarkhaeva Dominique Laniel Takayuki Ishii

The experimental study of hydrogen-bonds and their symmetrization under extreme conditions is predominantly driven by diffraction methods, despite challenges of localising or probing the hydrogen subsystems directly. Until recently, H-bond symmetrization has been addressed in terms of either nuclear quantum effects, spin crossovers or direct structural transitions; often leading to contradictory interpretations when combined. Here, we present high-resolution in-situ 1H-NMR experiments in diamond anvil cells investigating a range of systems containing linear O-H ⋯ O units at pressure ranges of up to 90 GPa covering their respective H-bond symmetrization. We found pronounced minima in the pressure dependence of the NMR resonance line-widths associated with a maximum in hydrogen mobility, precursor to a localisation of hydrogen atoms. These minima, independent of the chemical environment of the O-H ⋯ O unit, can be found in a narrow range of oxygen oxygen distances between 2.44 and 2.45 Å, leading to an average critical oxygen-oxygen distance of [Formula: see text] Å.

Symmetrization

Maxima and minima

10.1038/s41467-022-30662-4

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Citations (22)

Improving resolution of solid state NMR in dense molecular hydrogen

Applied Physics Letters (2019)

Thomas Meier Saiana Khandarkhaeva Jeroen Jacobs Natalia Dubrovinskaia Leonid Dubrovinsky

Recent advancements in radio-frequency resonator designs have led to the implementation of nuclear magnetic resonance in diamond anvil cells (DACs) at pressures well above 100 GPa. However, a relatively low resolution and the absence of decoupling sequences complicate the analysis of the results of solid state NMR in DACs. Here, we present the first application of homo-nuclear Lee-Goldburg (LG) decoupling at extreme conditions on high density molecular hydrogen. Lenz lens based two-dimensional resonator structures were found to generate a homogeneous B1 field across sample cavities as small as 12 picolitres, a prerequisite for optimal decoupling. At ideal LG conditions, the broad 1H resonance of molecular ortho-hydrogen was narrowed 1600-fold, resulting in line-widths of 3.1 ppm.

Decoupling (probability)

Solid hydrogen

10.1063/1.5123232

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Citations (11)

Mantle Flow Across the Baikal Rift Constrained With Integrated Seismic Measurements

AGUFM (2005)

Sergei Lebedev Thomas Meier R. D. van der Hilst

Rift zone

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Silica-water superstructure and one-dimensional superionic conduit in Earth’s mantle

Science Advances (2023)

Junwei Li Yanhao Lin Thomas Meier Zhi‐Pan Liu Wei Yang

Water in Earth’s deep interior is predicted to be hydroxyl (OH − ) stored in nominally anhydrous minerals, profoundly modulating both structure and dynamics of Earth's mantle. Here, we use a high-dimensional neuro-network potential and machine learning algorithm to investigate the weight percent water incorporation in stishovite, a main constituent of the subducted oceanic crust. We found that stishovite and water prefer forming medium- to long-range ordered superstructures, featuring one-dimensional (1D) water channels. Synthesizing single crystals of hydrous stishovite, we verified the ordering of OH − groups in the water channels through optical and nuclear magnetic resonance spectroscopy and found an average H-H distance of 2.05(3) Å, confirming simulation results. Upon heating, H atoms were predicted to behave fluid-like inside the channels, leading to an exotic 1D superionic state. Water-bearing stishovite could feature high ionic mobility and strong electrical anisotropy, manifesting as electrical heterogeneity in Earth's mantle.

Stishovite

Wüstite

Anhydrous

Superstructure

10.1126/sciadv.adh3784

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Citations (12)

Moissanite anvil cell design for giga-pascal nuclear magnetic resonance

Review of Scientific Instruments (2014)

Thomas Meier Tobias Herzig Jürgen Haase

A new design of a non-magnetic high-pressure anvil cell for nuclear magnetic resonance (NMR) experiments at Giga-Pascal pressures is presented, which uses a micro-coil inside the pressurized region for high-sensitivity NMR. The comparably small cell has a length of 22 mm and a diameter of 18 mm, so it can be used with most NMR magnets. The performance of the cell is demonstrated with external-force vs. internal-pressure experiments, and the cell is shown to perform well at pressures up to 23.5 GPa using 800 μm 6H-SiC large cone Boehler-type anvils. (1)H, (23)Na, (27)Al, (69)Ga, and (71)Ga NMR test measurements are presented, which show a resolution of better than 4.5 ppm, and an almost maximum possible signal-to-noise ratio.

10.1063/1.4870798

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Citations (19)