1.9 mm MAS Probe

Very Fast MAS Applications

1.9 mm MAS NMR Probe
1.9 mm MAS NMR Probe

Bruker’s very fast spinning MAS systems have opened up new worlds of spin manipulation enabling new and fascinating experiments in solid state NMR. This commitment began with the achievement of 35 kHz in the mid-nineties followed by 70 kHz ten years later.

With the new 1.9 mm probe Bruker is responding to an increasing area of interest and new market focus, and filling that gap by enabling fast spinning of nuclei less sensitive than 19F and 1H, offering 42 kHz spinning frequency at 10 μL active sample volume.

Benefits

  • New, optimized coil design delivers outstanding sensitivity
  • Available for probes from 200 to 1000 MHz, in SB or WB version. The standard probe is double resonance with tuning range 31P to 15N, easily extendable to 14N
  • Triple resonance probes are either fixed frequency (SB) or double broad banded (WB). HFX is also available
  • Dedicated tools enable easy sample packing and cleaning
  • Unique push-through design for easy rotor maintenance

Application Examples

1.9 mm MAS Probe - Applications
500 MHz 14N-1H dipolar HMQC spectrum of L-histidine, recorded with 250 μs recoupling time. Spinning frequency was 40 kHz, 14N pulses at 80 kHz RF field, 1H pulses at 115 kHz
700 MHz 1H wPMLG-5 spectrum of L-tyrosine-HCl: Spinning frequency was 42 kHz, the RF field of wPMLG was 140 kHz with an observe window of 4.6 μs.
700 MHz 2D FSLG-HETCOR of L-tyrosine-HCl. Spinning frequency was 42 kHz, RF field for FSLG was 140 kHz. Projections are 1D 13C CP/MAS and 1H wPMLG-5 spectra, respectively. Note that only directly bonded 1H – 13C correlations are visible.
500 MHz nutation curves for residual 1H signal in D2O and 1M KCl/D2O demonstrate the excellent performance of the 1.9 mm probe when used with lossy samples. Bottom curve is for regular D2O, top curve is for 1M KCl/D2O. The same RF power of 33 W was used for both so that the RF field decreases from 100 to 80 kHz.