Results 31 to 40 of about 736 (155)

Parahydrogen‐Based Hyperpolarization for Biomedicine

Angewandte Chemie International Edition, 2018
AbstractMagnetic resonance (MR) is one of the most versatile and useful physical effects used for human imaging, chemical analysis, and the elucidation of molecular structures. However, its full potential is rarely used, because only a small fraction of the nuclear spin ensemble is polarized, that is, aligned with the applied static magnetic field ...
Jan‐Bernd Hövener, Andrey N. Pravdivtsev, Bryce Kidd, C. Russell Bowers, Stefan Glöggler, Kirill V. Kovtunov, Markus Plaumann, Rachel Katz‐Brull, Kai Buckenmaier, Alexej Jerschow, Francesca Reineri, Thomas Theis, Roman V. Shchepin, Shawn Wagner, Pratip Bhattacharya, Niki M. Zacharias, Eduard Y. Chekmenev   +16 more
openaire   +6 more sources

Muonium hydride: The lowest density crystal

Physical Review Research, 2021
A muonium hydride molecule is a bound state of muonium and hydrogen atoms. It has half the mass of a parahydrogen molecule and very similar electronic properties in its ground state.
Youssef Kora, Massimo Boninsegni, Dam Thanh Son, Shiwei Zhang   +3 more
doaj   +1 more source

Crystal Structure of Parahydrogen [PDF]

Nature, 1930
WE have made two Debye-Scherrer films of parahydrogen cooled by helium boiling under normal pressure, yielding rather faint and granular lines. A much better intensity was obtained when the solid was irradiated at a temperature less than 2° K. The spacings which were deduced from these films cannot be explained by a simple space lattice of cubic ...
W. H. KEESOM, J. DE SMEDT, H. H. MOOT
openaire   +1 more source

A Versatile Compact Parahydrogen Membrane Reactor

ChemPhysChem, 2021
AbstractWe introduce a Spin Transfer Automated Reactor (STAR) that produces continuous parahydrogen induced polarization (PHIP), which is stable for hours to days. We use the PHIP variant called signal amplification by reversible exchange (SABRE), which is particularly well suited to produce continuous hyperpolarization.
TomHon, Patrick M., Han, Suyong, Lehmkuhl, Sören, Appelt, Stephan, Chekmenev, Eduard Y., Abolhasani, Milad, Theis, Thomas   +6 more
openaire   +4 more sources

Parahydrogen-induced polarization and spin order transfer in ethyl pyruvate at high magnetic fields

Scientific Reports, 2022
Nuclear magnetic resonance has experienced great advances in developing and translating hyperpolarization methods into procedures for fundamental and clinical studies. Here, we propose the use of a wide-bore NMR for large-scale (volume- and concentration-
Andrey N. Pravdivtsev, Arne Brahms, Frowin Ellermann, Tim Stamp, Rainer Herges, Jan-Bernd Hövener   +5 more
doaj   +1 more source

Representation of population exchange at level anti-crossings [PDF]

Magnetic Resonance, 2020
A theoretical framework is proposed to describe the spin dynamics driven by coherent spin mixing at level anti-crossings (LACs). We briefly introduce the LAC concept and propose to describe the spin dynamics using a vector of populations of the diabatic ...
B. A. Rodin, B. A. Rodin, K. L. Ivanov, K. L. Ivanov   +3 more
doaj   +1 more source

Intermolecular Nuclear Spin Hyperpolarization Transfer via Cross‐Relaxation Triggers RASER of Solute Molecules

Angewandte Chemie, EarlyView.
Radiofrequency amplification by stimulated emission of radiation (RASER) of solutes was achieved via parahydrogen‐induced polarization (PHIP) and polarization transfer from the produced hyperpolarization donors to solutes via the intermolecular nuclear Overhauser effect (NOE).
Ivan A. Trofimov, Anna P. Yi, Oleg G. Salnikov, Andrey N. Pravdivtsev, Henri de Maissin, Eduard Y. Chekmenev, Jan‐Bernd Hövener, Andreas B. Schmidt, Igor V. Koptyug   +8 more
wiley   +2 more sources

Adiabatic approach for heteronuclear SABRE hyperpolarization at high magnetic field

Journal of Magnetic Resonance Open, 2023
Signal Amplification By Reversible Exchange (SABRE) is a technique aimed at enhancing weak NMR signals of heteronuclei by utilizing the non-equilibrium spin order of parahydrogen. SABRE polarization transfer takes place by means of metalorganic complexes
Danil A. Markelov, Vitaly P. Kozinenko, Alexandra V. Yurkovskaya, Konstantin L. Ivanov   +3 more
doaj   +1 more source

Refractive index measurements of solid parahydrogen [PDF]

Optics Letters, 2011
Solid para-H2 is a promising gain medium for stimulated Raman scattering, due to its high number density and narrow Raman linewidth. In preparation for the design of a cw solid hydrogen Raman laser, we have made the first measurements, to our knowledge, of the index of refraction of a solid para-H2 crystal, in the wavelength range of 430-1100 nm. For a
Manori, Perera, Brian A, Tom, Yuki, Miyamoto, Michael W, Porambo, Lauren E, Moore, William R, Evans, Takamasa, Momose, Benjamin J, McCall   +7 more
openaire   +2 more sources

Design of the Reactor, Selection of Catalyst for Ortho to Para Hydrogen Conversion and Preliminary Design of Cryogenic System for its Liquefaction [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2004
Hydrogen is an unusual substance in that its molecule exists in two forms, known as ortho and para, with markedly different properties. Energy level of the ortho molecule is higher than para, therefore, the latter is employed for industrial purposes ...
Naser Saghatoleslami, Javad Sargolzaei, Seyyed Mahmood Mousavi   +2 more
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