Transfer of para-hydrogen spin order into polarization by diabatic field cycling

Haukur Jóhannesson, Oskar Axelsson, Magnus Karlsson

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In a para-hydrogen induced polarization (PHIP) experiment, it is possible to obtain a substantial net polarization of a hetero nucleus using a diabatic field cycling scheme. This is experimentally demonstrated for hydroxyethyl propionate. The screening of the ambient magnetic field was accomplished by using several concentric mu-metal cylinders. The field cycling is modeled as a sudden decrease from intermediate field to low field, followed by an adiabatic remagnetization. An analytical expression for the polarization as a function of the constituent scalar couplings, using an idealized field cycling profile, is derived for an AA'X spin system. It is also demonstrated that the hyperpolarized compound can be used for magnetic resonance imaging (MRI). (C) 2004 Academie des sciences.
Original languageEnglish
JournalComptes Rendus Physique
Volume5
Issue number3
Pages (from-to)315-324
ISSN1631-0705
DOIs
Publication statusPublished - 2004
Externally publishedYes

Keywords

  • Para-hydrogen induced polarization
  • Diabatic
  • Field cycling
  • Polarisation induite par para hydrogène
  • diabatique
  • champ magnétique cyclé
  • ASTRONOMY
  • PHYSICS,
  • PARAHYDROGEN-INDUCED POLARIZATION
  • ALIGNMENT
  • para-hydrogen induced polarization
  • diabatic
  • field cycling

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