IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
STRATEGIES FOR THE ACQUISITION OF J-SPECTRA USING PARAHYDROGEN INDUCED POLARIZATION
Autor/es:
R.H. ACOSTA
Lugar:
Wellington
Reunión:
Congreso; Magnetic Resonance in Porous Media; 2014
Resumen:
The application of parahydrogen for the generation of
hyperpolarization has increased continuously during the
last years. When the chemical reaction that deposits the
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 only a few Hz. This imposes a stringent
limit to the required homogeneity of the magnetic field in
order to avoid signal cancellation. In this work we show
that the spectrum of the PHIP signal acquired with a Carr-
Purcell-Meiboom-Gill (CPMG) sequence, referred to as
J-Spectroscopy [2], not only presents an enhanced spectral
resolution compared to standard the NMR-spectrum, but also
avoids partial peak cancellation.
Experimental and numerical simulations concerning the
hydrogenation of Hexene with parahydrogen in PASADENA
conditions are presented. Acquisition with a digital filter is
used to select a desired multiplet, namely a partial J-Spectra
acquisition [3]. The performance of the method is tested
on a thermally polarized sample is included showing that
the corresponding partial J-Spectra are unaffected by
large inhomogeneities in the polarizing magnetic field [4].
Additionally we show that the method has the potential to
discriminate PHIP-induced signals from thermal-induced ones,