pulsed nuclear magnetic resonance spectroscopy para-hydrogen induced polarisation enhanced nuclear magnetic resonance spectroscopy PHIP NMR CHMO:0001177 Spectroscopy where the energy states of protons derived from para-hydrogen (dihydrogen with an antisymmetric nuclear spin arrangement) placed in a static magnetic field are interrogated by inducing transitions between the states via radio frequency irradiation. Each experiment consists of a sequence of radio frequency pulses with delay periods in between them. The non-Boltzmann spin population generated by para-hydrogen-derived protons gives rise to signal enhancement in the spectra, facilitating the detection of species present at low concentration. https://orcid.org/0000-0001-5985-7429 2009-03-19T09:59:40Z PHIP-enhanced NMR para-hydrogen induced polarization enhanced NMR spectroscopy PHIP-NMR