نتایج جستجو برای: parahydrogen
تعداد نتایج: 287 فیلتر نتایج به سال:
We use symmetry arguments and simple model systems to describe the conversion of the singlet state of parahydrogen into an oscillating sample magnetization at zero magnetic field. During an initial period of free evolution governed by the scalar-coupling Hamiltonian HJ, the singlet state is converted into scalar spin order involving spins throughout the molecule. A short dc pulse along the z ax...
Nuclear magnetic resonance, conventionally detected in magnetic fields of several tesla, is a powerful analytical tool for the determination of molecular identity, structure and function. With the advent of prepolarization methods and detection schemes using atomic magnetometers or superconducting quantum interference devices, interest in NMR in fields comparable to the Earth’s magnetic field a...
Figure 1: Left: three dimensional scheme of the phantom used for MRI experiments. Center tube is filled with PHIP substance (orange), outer tube contains water (blue). Right: the FIDs originating from the whole phantom. The blue signal stems from thermally polarized water and thermally polarized PHIP substanc. The red signal is generated by thermally polarized water and hyperpolarized PHIP subs...
Raman and infrared spectroscopy of para-H2 to pressures in excess of 200 GPa and to 8 K using new ultrapure synthetic diamond anvils reveals numerous new vibrational excitations in the three highpressure phases. Highly resolved Raman-active librons indicate differences in orientational ordering between phases II and III, including evidence for changes within phase II. The librons in phase III a...
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