Doty OptiMAS™ for Narrow Bore

Extending Sample Temperatures on the OptiMAS Probe to 86K

Low Temperature (86 K) MAS on a NB DI4 OptiMASTM Probe

Low Temperature 13C (86 K) MAS on a NB DI4 OptiMASTM Probe

OptiMAS Auto Sample Eject
	Enlarged section showing rotor capture

55% Gain in S/N with Cooling in OptiMASTM and High Resolution: OptiMASTM probe with DI-4 spinner and low noise (or cooled) preamps. Cooling the low-frequency and mid-frequency high voltage plug-in capacitors to 100 K with nitrogen provides major improvement in signal to noise ratio. “Cold Zone” cooling contributed 42% while cooled preamps contributed 13% to the 55% gain in S/N.
Figures below: OptiMASTM Probe Glycine CP/MAS Spectra 70 kHz decoupling, 1H at 300 MHz (the sample was not all α-glycine)
Figure A: " Cold zone" at RT Spectrometer System Noise Figure =1.1 dB.
Figure B: "Cold zone" at -179oC Spectrometer System Noise Figure =1.1 dB.
Figure C: "Cold zone" at -180oC With Cooled Preamps Spectrometer System Noise Figure =0.7 dB.

High Resolution - OptiMASTM

Below: 1H Resolution Spectrum at 300 MHz Water Spectrum FWHM=0.6 Hz, 8 Scans

These important capabilities found in our other MAS probes,
are also in the new OptiMAS™. 

Triple-resonance, Double-broadband Tuning

• H-F/X/Y, H/X/lock or H/F/X

  Maximize versatility with X and Y channels that are multinuclear, even in probes with ¹H resolution optimized – to 0.003 ppm FWHM.

Lowest Decoupler Heating

120 kHz decoupling fields at 750 MHz with 6-25 times lower sample heating compared to solenoid-only probes.   Stable tuning, low heating, high sensitivity, and excellent B₁ matching on both coils, even for lossy samples.   Unlike many sample coil designs, the B₁ homogeneity of the XC coil is not significantly affected by the sample because of its inherent electrical balance, symmetry, and very low inductance.

For more information, please see
our recent poster on "Maximum S/N in Narrow-Bore Solids - The OptiMAS™ , ENC 2006, Asilomar, CA, USA.

Please contact sales with questions or quote requests.