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Fig. 2 | Journal of Analytical Science and Technology

Fig. 2

From: 1H-31P home-built solid-state NMR probe with a scroll coil for 400-MHz NB magnet for biological lossy sample

Fig. 2

Schematic circuit diagram for the 400-MHz narrow-bore 1H-31P double resonance probe with a solenoid coil. Capacitors C1 and C2 were variable capacitors that were used for tuning and matching the high-frequency 1H channel (400.13 MHz). C3 and C4 were variable capacitors that were used for tuning and matching the low-frequency 31P channel (161.97 MHz). All variable capacitors have a changeable range between 1 and 10 pF. Capacitors C5, C6, and C7 have a fixed capacity of 10 pF, 5.6 pF, and 3.9 pF respectively. L1 is a scroll coil (with ID = 5 mm and length L = 15 mm), and λ/4 coaxial cable length is optimized to 13.5 cm. The impedance of the probe circuit was matched to 50 Ω

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