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.