Hyperpolarized multiple quantum coherences at ultra-low magnetic fields increase 15N parahydrogen-induced polarization
Andrey N. Pravdivtsev1, Nicolas Kempf2, Markus Plaumann3, Johannes Bernarding3, Klaus Scheffler2, Jan-Bernd Hövener1, and Kai Buckenmaier2
1SBMI, MOIN CC, UKSH, Kiel University, Kiel, Germany, 2High-Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany, 3Institute for Biometrics and Medical Informatics, Otto-von-Guericke University, Magdeburg, Germany
We used signal amplification by reversible exchange of parahydrogen (SABRE) at low (~1 mT) and ultra-low (~1 μT, ULF) magnetic fields. We proposed and used ULF correlation spectroscopy (COSY) method to analyze PHIP spin order in real-time. Coherences up to the third-order were observed experimentally. Furthermore, we analyzed SABRE in alternating magnetic fields (alt-SABRE). We measured the evolution of 1H-15N zero-quantum coherences and have shown that they persist during field alternation and depend on the magnetic field strength. The resulting 15N-polarization in the alt-SABRE experiment was with magnetic was appoximately 30% higher.
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