High-field QCPMG NMR of large quadrupolar patterns using resistive magnets.
Spectroscopy in a high magnetic field reduces second-order quadrupolar shift while increasing chemical shift. It changes the scale between quadrupolar and chemical shift of half-integer quadrupolar spins. The application of QCPMG multiple echo for acquiring large quadrupolar pattern under the high magnetic field of a 25 T resistive magnet is presented for acquiring large quadrupolar patterns. It shows that temporal field fluctuations and spatial homogeneity of the Keck magnet at the NHMFL contribute about +/- 20 ppm in line broadening. NMR patterns which have breadths of hundreds to thousands of kilohertz can be efficiently recorded using a combination of QCPMG and magnetic field stepping with negligible hindrance from the inhomogeneity and field fluctuations of powered magnets.
Hung
Ivan
I
Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA.
Shetty
Kiran
K
Ellis
Paul D
PD
Brey
William W
WW
Gan
Zhehong
Z
D005240:Feasibility Studies; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D009942:Organometallic Compounds / Q000737:chemistry
D009942:Organometallic Compounds; C013108:metallocene