NMR at earth's magnetic field using para-hydrogen induced polarization

作者：Hamans Bob C^*; Andreychenko Anna; Heerschap Arend; Wijmenga Sybren S; Tessari Marco

来源：Journal of Magnetic Resonance, 2011, 212(1): 224-228.

DOI：10.1016/j.jmr.2011.06.011

• Earth field
• NMR
• Hydrogenation
• Field cycling
• Parahydrogen

A method to achieve NMR of dilute samples in the earth's magnetic field by applying para-hydrogen induced polarization is presented. Maximum achievable polarization enhancements were calculated by numerically simulating the experiment and compared to the experimental results and to the thermal equilibrium in the earth's magnetic field. Simultaneous (19)F and (1)H NMR detection on a sub-milliliter sample of a fluorinated alkyne at millimolar concentration (similar to 10(18) nuclear spins) was realized with just one single scan. A highly resolved spectrum with a signal/noise ratio higher than 50:1 was obtained without using an auxiliary magnet or any form of radio frequency shielding.

• 出版日期2011-9