Hyperpolarization can be kept for times longer than T-1 if it is maintained in a singlet state, from which transitions are not allowed. Another, more direct, way to slower the relaxation process consists in the use of perdeuterated molecules. Here both methods have been applied and the hyperpolarization (induced by para-H-2) decay rate has been measured at two different magnetic fields: earth held and zero field. While relaxation is very slow at earth field, it becomes faster at zero field: this rather unexpected finding has been explained on the basis of isotropic mixing between H-1 and H-2.

Effect of low and zero magnetic field on the hyperpolarization lifetime in parahydrogenated perdeuterated molecules

REINERI, Francesca;SANTELIA, Daniela;GOBETTO, Roberto;AIME, Silvio
2009

Abstract

Hyperpolarization can be kept for times longer than T-1 if it is maintained in a singlet state, from which transitions are not allowed. Another, more direct, way to slower the relaxation process consists in the use of perdeuterated molecules. Here both methods have been applied and the hyperpolarization (induced by para-H-2) decay rate has been measured at two different magnetic fields: earth held and zero field. While relaxation is very slow at earth field, it becomes faster at zero field: this rather unexpected finding has been explained on the basis of isotropic mixing between H-1 and H-2.
200
15
20
Parahydrogen; Hyperpolarization; Relaxation rate; Singlet state; Nuclear spin states; C-13; Polarization
Francesca Reineri; Daniela Santelia; Roberto Gobetto; Silvio Aime
File in questo prodotto:
File Dimensione Formato  
JMR2009.pdf

Accesso riservato

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 328.97 kB
Formato Adobe PDF
328.97 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/71734
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact