Para-hydrogen and synthesis allow

Bowers CR, Weitekamp DP. 1987. Para-hydrogen and synthesis allow dramatically enhanced nuclear alignment. J Am... 

The transformation of this molecular rotational order into nuclear spin order during the hydrogenation reaction leads to typical polarization patterns in the NMR spectra of the hydrogenation products. Depending on whether the experiment is performed inside or outside of a magnetic field (see Fig. 21.6), these types of experiments have been referred to under the acronyms PASADENA (Para-hydrogen and Synthesis Allow Dramatically Enhanced Nuclear Alignment) or... 

This concept has originally been named PASADENA (Parahydrogen And Synthesis Allow Dramatically Enhanced Nuclear Alignment) [6], but the spectroscopic method based on this phenomenon has subsequently also been called PHIP (Para-Hydrogen Induced Polarization) [7]. In this chapter the abbreviation PH IP will be used throughout. 

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