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MQR TD-NMR Research System
The MQR from Oxford Instruments is a low resolution, high performance TD-NMR research system. It is designed for applications based on diffusion and/or relaxation measurements. The system consists of 23 MHz (0.54T) permanent magnet, a high performance digital spectrometer and a selection of interchangeable 10, 18 and 26 mm probes.
The MQR is provided with the Application Developer software package – a completely integrated development environment that allows users to write pulse sequences, run and debug sequences, set parameters and visualize the results. Shaped gradient pulses and shaped RF can be added, and calculations can be embedded in the pulse sequences. An editable library of standard pulse sequences is provided, as well as a standard data analysis software package that includes 1D Inverse Laplace transforms and simple curve fitting.
Extra options include high-strength bipolar pulsed field gradients, variable temperature probes, T1 rho capability and advanced data analysis including 2D Inverse Laplace transforms.
| Operating frequency | 23 MHz (0.54T field) |
| Probe sizes (diameter) | 10mm, 18mm, 26mm |
| Probe deadtime | <5 µs (10 mm probe); <8 µs (18 mm probe); <12 µs (26 mm probe) |
| P90 (10 mm probe) | <3 µs |
| Data sampling rate | Dependent on filters, typically 16 MHz/16 bit |
| Data point capacity |
>256 k |
| RF Power | 250 W |
| RF duty cycle | 20%; 40% optional for T1 rho |
| Pulsed field gradients | Up to 350G/cm (depending on probe) |
| Available pulse sequences | FID, CPMG, T1 inversion recovery, T1 saturation recovery, solid echo, FID/Hahn, 1-D profile (requires gradients), diffusion (requires gradients) |
| Liquid-controlled variable temperature probe | 10 mm or 18 mm, -10 to +80 °C (requires additional equipment) |
| Gas-controlled variable temperature probe | 10 mm or 18 mm, -30 to +150 °C (requires additional equipment and depends on the temperature of the incoming gas) |
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