Results 131 to 140 of about 2,750 (239)

Density Matrix of Two Spin-1/2 Particles: Pure and Mixed States

Concepts in Magnetic Resonance: Part A, Bridging Education and Research
The density matrix of an arbitrary pure state of a system consisting of two spin-1/2 particles is derived from the Pauli spin angular momentum operators.
Eric R. Johnston
doaj   +1 more source

Quantum Monte Carlo study of thin parahydrogen films on graphite

Results in Physics
The low-temperature properties of one and two layers of parahydrogen adsorbed on graphite are investigated theoretically through Quantum Monte Carlo simulations. We adopt a microscopic model that explicitly includes the corrugation of the substrate.
Jie-Ru Hu, Massimo Boninsegni
doaj   +1 more source

UV Photochemistry of Benzene and Cyclohexadienyl Radical in Solid Parahydrogen

, 2016
Matrix-isolation spectroscopy in solid parahydrogen is a powerful technique for the study of photochemical reactions in detail. It is especially suited for the detection of chemical intermediates and unstable molecular products of photochemical reactions
Shin Yi Toh (1633825), Pavle Djuricanin (1633831), Jun Miyazaki (1633828), Takamasa Momose (1289220)   +3 more
core   +1 more source

SABRE-hyperpolarization dynamics of [1-13C]pyruvate monitored by in situ zero- to ultra-low field NMR

Journal of Magnetic Resonance Open
Hyperpolarized [1–13C]pyruvate is the leading metabolite used in the emerging field of hyperpolarization-enhanced MRI. Signal amplification by reversible exchange (SABRE) is a straight forward hyperpolarization method that has recently been shown to ...
Adam Ortmeier, Keilian MacCulloch, Danila A. Barskiy, Nicolas Kempf, John Z Myers, Rainer Körber, Andrey N Pravdivtsev, Kai Buckenmaier, Thomas Theis   +8 more
doaj   +1 more source

Catalytic ortho- to parahydrogen conversion in liquid hydrogen [PDF]

, 2017
The kinetics of the catalytic conversion of ortho- to parahydrogen was studied for the two catalysts, IONEX® and OXISORB®. The study also involved the optimization of an experimental technique for the conversion of orthohydrogen in a static setup.
Karlsson, Emil
core  

High-Resolution Hyperpolarized J‑Spectra with Parahydrogen Discrimination

, 2015
Parahydrogen-induced polarization (PHIP) has become a powerful tool not only to overcome the low intrinsic sensitivity of nuclear magnetic resonance (NMR) but also as a probe for catalytic reactions, as a contrast agent in magnetic resonance imaging (MRI)
I. Prina (1303236), L. Buljubasich (1303233), R. H. Acosta (1303239)   +2 more
core   +1 more source

Conversion of Parahydrogen to Orthohydrogen

, 1966
Heisenberg (53) and Hund (57) postulated the existence of two modifications of hydrogen. This occurred as a result of Heisenberg\u27s previous explanation of the existence for orthohelium and parahelium using quantum theory. From analogous considerations,
Winkler, George A.
core  

An Experimental Setup to Study Electron Transport and Thermalization in Cryogenic Para-Hydrogen Crystal Matrices

Instruments
We present an experimental apparatus to investigate electron transport and thermalization in cryogenic para-hydrogen crystal matrices. This paper describes the techniques used to grow and characterize the cryogenic para-hydrogen crystals, the optical ...
Piergiorgio Antonini, Massimo Benettoni, Armando F. Borghesani, Caterina Braggio, Roberto Calabrese, Giovanni Carugno, Federico Chiossi, Ugo Gasparini, Franco Gonella, Marco Guarise, Alen Khanbekyan, Alessandro Lippi, Augusto Lombardi, Emilio Mariotti, Madiha M. Makhdoom, Giuseppe Messineo, Jacopo Pazzini, Giuseppe Ruoso, Luca Tomassetti, Marco Zanetti   +19 more
doaj   +1 more source

Probing nanoparticle proximity effects on selective butadiene hydrogenation over Pd-Au/TiO2 with parahydrogen-induced polarization NMR

Journal of Magnetic Resonance Open
Selective butadiene hydrogenation to butene is a crucial process in the petrochemical industry, however, a comprehensive understanding of the underlying structure-activity relationships remains elusive.
Bintian Lu, Weiyu Wang, Shuangqin Zeng, Xiuzhi Gao, Jun Xu, Feng Deng   +5 more
doaj   +1 more source

Analysis of parahydrogen polarized spin system in low magnetic fields

, 2014
Nuclear magnetic resonance (NMR) spectra of spin systems polarized either thermally or by parahydrogen exhibit strikingly different field dependencies.
Theis, T., Blümich, Bernhard, Türschmann, P., Colell, J., Appelt, S., Tuerschmann, P., Bluemich, B.   +6 more
core   +1 more source