IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
High Resolution Para-Hydrogen Induced Polarization (PHIP) in Inhomogeneous Magnetic Fields
Autor/es:
LISANDRO BULJUBASICH; PRINA, I.; M. B. FRANZONI; KERSTIN MÜNNEMANN; H. W. SPIESS; R. H. ACOSTA
Reunión:
Conferencia; 18th ISMAR Meeting; 2013
Resumen:
The application of parahydrogen for the generation of hyperpolarization has increased continuously during the last years. When the chemical reaction, that deposites the former parahydrogen atoms into the target molecule, is carried out at the same field as the NMR experiment (PASADENA protocol [1]) an anti-phase signal is obtained, with a separation of the resonance lines of a few Hz. This imposes a stringent limit to the homogeneity of the magnetic field in order to avoid signal cancellation. In this work we detect the signal arising from hyperpolarized Hexene by means of a CPMG pulse train, based on the approach usually referred to as J-Spectroscopy [2-4]. After Fourier transformation the obtained J-Spectra not only presents an enhanced spectral resolution compared to the NMR-spectrum but also avoids partial peak cancellation.  Results on a thermally polarized sample will be included showing that the corresponding partial J-Spectra (i.e. J-Spectra combined with digital filters at the acquisition period [3]) are unaffected by large inhomogeneities in the polarizing magnetic field. Turning to hyperpolarization, partial J-Spectra in PASADENA conditions during the hydrogenation of Hexyn with highly resolved lines will be shown. Finally, limitations and the applicability of the method to either obtain spectral information of the sample or to be able to monitor chemical reactions of vey diluted samples will be discussed.