BMAX xy Low E

Doty BMAX - The Ultimate in Conventional Solids or Liquids MAS Probes

Highest S/N

Compare: 205:1 on 50 mg of glycine, 13C. 258:1 on 18 mg of HMB, 13C.
4 mm BMAX at 500 MHz, H/X tuning.

Highest rf field strengths and efficiency

Compare: 1.3-µs π/2 pulse with only 640 W. Above for 13C,
3 mm DI-3 at 500 MHz, H/X tuning.

Extremely robust and easy to use.

3 year limited warranty.

Fast sample spinning in easy-to-use high-sensitivity Si3N4 rotors

28 kHz (soon 30 kHz) in the DI-3

18 kHz (soon 20 kHz) in the DI-4

(and more spinners – see below)

H-F/X/Y broad-band tuning with maximum performance.

Tuning options from 109Ag to 31P. High-power, long-acquisition 1H decoupling (even at 950 MHz). 100 ms of 70 kHz 1H dec. on the DI-4 at 500 MHz with 250 W.

Widest sample-temperature ranges.

NB options from -170°C to +150°C

WB options from -170°C to +250°C

Lowest thermal gradients.

<3°C under combined fast MAS, high decoupling, and XVT.

Lowest background signals.

Minimal 13C, 1H, 19F,27Al, 29Si, 11B, 15N, 23Na, 2H, 17O, … Si3N4 and non-magnetic alloy construction.

Wide Temperature Ranges Options:

Narrow Bore:

-80°C to +120°C for Standard NB VT Range

-150°C to +150°C for XVT (extended NB VT)

-170°C for LXVT (low temperature range extended)

Wide Bore:

-140°C to +170°C for Standard WB VT Range

-150°C to +250°C for XVT (extended WB VT)

-170°C for LXVT (low temperature range extended)

Auto sample eject/load – available for narrow bore

Best axial and Q stability for minimal artifacts in 2D spectra (patented coil and spinner technology).

Minimum E fields for negligible RF sample heating.

Spectral resolution approaching liquids standards –can be under 4 ppb.

Exceptional 1H B1 homogeneity over full sample.

Compatible with Agilent, Bruker, and JEOL

Superior spinning speed stability – under 1 Hz.

Clean optical sensing for pulse-rotation synchronization.

Si3N4 rotors, for best S/N and longest lifetime.

The probe can be optimized for maximum 1H, if 1H decoupling is of greatest concern. See the ProtonMAX.

Highest sensitivity on X and Y, with inner solenoid

Order of magnitude lower decoupler heating compared to solenoid only


Spectra 1

4 mm BMAX CP/MAS at 500 MHz, Glycine, H/C tuning, S/N=205:1 >49.7 mg of α-glycine, 4 scans, 97.4 kHz TPPM1H decoupling, 46 μL sample, ramped-CP at 62 kHz for 7.5 ms, 10 kHz MAS


3 mm BMAX H/X @ 500 MHz, 2D MQ-MAS spectrum of the 5/2 27Al transition of Kyanite MQ-MAS spectrum of Kyanite in the DI-3 BMAX probe. 180 kHz 27Al field strength. Spin rate is 22 kHz.Spectra: Mike Frey, JEOL; and George Entzminger and Paul Ellis, Doty Scientific
Spinner Assembly
Maximum Speed
3 mm DI3, Drop-In *
28 kHz
4 mm DI4, Drop-In *
18 kHz
4 mm XC4
22 kHz
5 mm XC5
18 kHz
7 mm XC7 (WB Only)
12 kHz
* Top Loading (auto sample eject) requires a Drop-Iin MAS spinner. (Sample eject is currently only available in Narrow Bore)


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