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,