title: NMR at earth's magnetic field using para-hydrogen induced polarization.
abstract: 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 19F and 1H NMR detection on a sub-milliliter sample of a fluorinated alkyne at millimolar concentration (∼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.
authors.affiliation: Department of Radiology, Radboud University Nijmegen Medical Centre, Geert Grooteplein 10, 6525 GA Nijmegen, The Netherlands. b.hamans@rad.umcn.nl
authors.forename: Bob C
authors.initials: BC
authors.lastname: Hamans
authors.forename: Anna
authors.initials: A
authors.lastname: Andreychenko
authors.forename: Arend
authors.initials: A
authors.lastname: Heerschap
authors.forename: Sybren S
authors.initials: SS
authors.lastname: Wijmenga
authors.forename: Marco
authors.initials: M
authors.lastname: Tessari
mesh_terms: D018534:Earth, Planet; D004735:Energy Transfer; D005462:Fluorine Radioisotopes; D006859:Hydrogen / Q000737:chemistry*; D007202:Indicators and Reagents; D060526:Magnetic Fields; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D011522:Protons
chemical_list: D005462:Fluorine Radioisotopes; D007202:Indicators and Reagents; D011522:Protons; D006859:Hydrogen