Results 171 to 180 of about 4,129 (201)
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Diffusion of hydrogen fluoride in solid parahydrogen
The Journal of Chemical Physics, 2013We studied diffusion of hydrogen fluoride (HF) in solid parahydrogen (pH2) around 4 K. Diffusion rates were determined from time dependence of FT-IR spectra of HF monomers. The absorption of HF monomers shows temporal decay due to dimerization reaction via diffusion.
Hiroki, Ooe +9 more
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Measurements of the Viscosity of Parahydrogen
The Journal of Chemical Physics, 1965The coefficient of shear viscosity η of parahydrogen has been measured by the torsional crystal method at temperatures from 14° to 100°K and at pressures up to 345 atm. Twenty compressed fluid isotherms encompass the density range 0.003–0.087 g/cm3 and include the critical region. The precision and accuracy of the measurements is about 0.5%.
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Thermal conductivity of parahydrogen
Journal of Chemical & Engineering Data, 1984Mesure experimentale de la conductivite thermique du parahydrogene pour 8 isothermes de 100 a 275 K avec intervalles de 25 K, des pressions jusqu'a 12 MPa et des densites de 0 a 12 mol ...
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Continuous hyperpolarization with parahydrogen in a membrane reactor
Journal of Magnetic Resonance, 2018Hyperpolarization methods entail a high potential to boost the sensitivity of NMR. Even though the "Signal Amplification by Reversible Exchange" (SABRE) approach uses para-enriched hydrogen, p-H2, to repeatedly achieve high polarization levels on target molecules without altering their chemical structure, such studies are often limited to batch ...
Sören, Lehmkuhl +6 more
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Rotation of Water in Solid Parahydrogen and Orthodeuterium
The Journal of Physical Chemistry A, 2010The far-infrared spectra of solid orthodeuterium and solid normal deuterium are presented and compared to the corresponding spectra of solid parahydrogen and solid normal hydrogen. Spectra of water in orthodeuterium are compared to spectra of water in parahydrogen.
J, Ceponkus, P, Uvdal, B, Nelander
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Raman gain measurement in solid parahydrogen
Optics Letters, 2000We report a steady-state Raman gain measurement of the Q(1)(0) transition (v = 1 ? 0, J = 0 ? 0) in solid parahydrogen. We carry out measurements by pumping with a continuous-wave frequency-doubled YAG laser at 532 nm and observing the direct amplification of a probe-laser beam for the first Stokes transition at 683 nm.
M, Katsuragawa, K, Hakuta
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Isothermal compressibility of solid parahydrogen
Journal of Low Temperature Physics, 1970The method of the determination of isothermal compressibility of solid parahydrogen on the basis of dielectric constant measurements has been described. The data on isothermal compressibility of solid parahydrogen in the temperature range of 6–14.5°K and at pressures of 0–180 atm have been presented.
B. G. Udovidchenko, V. G. Manzhelii
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Improving NMR and MRI Sensitivity with Parahydrogen
2012Parahydrogen induced polarisation (PHIP) has wide utility in NMR and MRI as it can increase the sensitivity of both techniques. The transfer of spin order from parahydrogen to nuclei in the analyte leads to an increased magnetic response following interrogation by RF pulses.
Simon B, Duckett, Ryan E, Mewis
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Catalysis of the Ortho-Parahydrogen Conversion
1960Certain metallic oxides such as chromic oxide, cerium oxide, and neodymium oxide have been reported as highly effective catalysts for ortho-parahydrogen conversion because of their paramagnetic properties. We were familiar with the performance of chromic oxide on alumina pellets since this has been successfully used in the CEL liquefier s over a period
D. H. Weitzel +4 more
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