title: A dedicated spectrometer for dissolution DNP NMR spectroscopy.
abstract: Using low temperature dynamic nuclear polarisation (DNP) in conjunction with dissolution makes it possible to generate highly polarised nuclear spin systems for liquid state applications of nuclear magnetic resonance spectroscopy. However, in its current implementation, which requires the transfer of the solute between two different magnets, the hyperpolarisation strategy is limited to spin systems with relatively long longitudinal relaxation time constants. Here we describe the design and construction of a dedicated spectrometer for DNP applications that is based on a magnet with two isocentres. DNP enhancement is carried out in the upper compartment of this magnet in a low temperature environment at 3.35 T, while a 9.4 T isocentre in the lower compartment is used for high resolution NMR spectroscopy. The close proximity (85 cm) of the two isocentres makes it possible to transfer the sample in the solid state with very little loss of spin polarisation. In first performance tests this novel experimental set-up proved to be superior to the strategy involving two separate magnets.
authors.affiliation: Sir Peter Mansfield Magnetic Resonance Centre, School of Physics & Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: James
authors.initials: J
authors.lastname: Leggett
authors.forename: Robert
authors.initials: R
authors.lastname: Hunter
authors.forename: Josef
authors.initials: J
authors.lastname: Granwehr
authors.forename: Rafal
authors.initials: R
authors.lastname: Panek
authors.forename: Angel J
authors.initials: AJ
authors.lastname: Perez-Linde
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Horsewill
authors.forename: Jonathan
authors.initials: J
authors.lastname: McMaster
authors.forename: Graham
authors.initials: G
authors.lastname: Smith
authors.forename: Walter
authors.initials: W
authors.lastname: Köckenberger