- A 4-mm probe for (13)C CP/MAS NMR of solids at 21.15 T.
A 4-mm probe for (13)C CP/MAS NMR of solids at 21.15 T.
Journal of magnetic resonance (San Diego, Calif. : 1997) (2002-06-26)
H J Jakobsen, P Daugaard, E Hald, D Rice, E Kupce, P D Ellis
PMID12081453
ABSTRACT
The design of a broadband 4-mm magic-angle spinning (MAS) X-(1)H/(19)F double resonance probe for cross-polarization (CP)/MAS NMR studies at 21.15 T ((1)H at 900 MHz) is described. The high-frequency (1)H/(19)F channel employs a new and efficient transmission line tuning design. The first (13)C CP/MAS NMR spectra recorded at 21.15 T have been obtained with this probe and exhibit the best S/N per milligram sample of hexamethylbenzene achieved so far for a 4-mm rotor.