Metastable liquid mixtures of parahydrogen and orthodeuterium are studied theoretically by means computer simulations. No reduced propensity the mixture to undergo crystallization is observed, compared that pure parahydrogen. Demixing two species as a precursor not observed either.

Solid parahydrogen provides a novel matrix for isolation spectroscopy of atoms and molecules. Ro-vibrational motion of molecules embedded in solid parahydrogen is well quantized on account of the weak interactions in the crystal and of the softness of the crystal being characteristic of quantum crystals. Most of the observed spectral linewidths are one or two orders of magnitude sharper than th...

Abstract Parahydrogen‐based nuclear spin hyperpolarization allows various magnetic‐resonance applications, and it is particularly attractive because of its technical simplicity, low cost, ability to quickly (in seconds) produce large volumes hyperpolarized material. Although many parahydrogen‐based techniques have emerged, some them remain unexplored due the lack careful optimization studies. I...

Introduction Parahydrogen-Induced Polarization (PHIP) leads to strong signal enhancement in H-NMR if unsaturated substrates are hydrogenated with parahydrogen (p-H2) applying an appropriate catalyst. As shown before, this polarization can be transferred to heteronuclei such as C. For imaging the lung, a F-hyperpolarized contrast agent should be available, if possible for inhalation. Normally, t...

Nuclear magnetic resonance (NMR) spectra of spin systems polarized either thermally or by parahydrogen exhibit strikingly different field dependencies. Thermally polarized spin systems show the well-known roof effect, observed when reducing magnetic field strengths which precludes the independent determination of chemical shift differences and J-coupling constants at low-fields. Quantum mechani...

An experimental approach for the production of catalyst-free hyperpolarised ethanol solution in water via heterogeneous hydrogenation of vinyl acetate with parahydrogen and the subsequent hydrolysis of ethyl acetate was demonstrated. For an efficient hydrogenation, liquid vinyl acetate was transferred to the gas phase by parahydrogen bubbling and almost completely converted to ethyl acetate wit...

We report the results of our preliminary investigations into the suitability of condensed-phase parahydrogen as a Raman-shifting medium for infrared cavity ringdown laser absorption spectroscopy. We have observed the conversion of ;10-ns pulses of 532-nm radiation into first-, second-, and third-order vibrational Stokes radiation in bulk liquid and solid parahydrogen after a single 11-cm pass. ...

Magnetic field sweeps are used to transfer parahydrogen-induced polarization from hydrogen atoms onto heteronuclear spins such as carbon-13. In this work we describe and implement constant adiabaticity sweep profiles for purpose.

We employ parahydrogen induced polarization with side-Arm hydrogenation (PHIP-SAH) to polarize (1-13C)-pyruvate via a new pulsed magnetic resonance experiment.

The solid parahydrogen crystal has proven to be an extraordinary matrix medium. The very weak intermolecular interaction with relatively high-zero-point lattice vibration in combination with the small mass of the molecule lead to a highly quantum system in which hydrogen molecules rapidly tunnel between equivalent sites. This tunnelling process is the basis for a powerful self-annealing behavio...