Continuous wave spectrometer

NMRfor analysisfor teaching

This continuous-wave (CW) Nuclear Magnetic Resonance (NMR) spectrometer is designed for teaching and material characterization. It applies radio‑frequency excitation within a strong magnetic field and detects nuclear magnetic moment responses for molecular and compositional analysis, suitable for studies such as 1H and 19F parameter measurement.

Instrument composition:

• Magnet
• Magnetic-field scanning power supply
• Tunable oscillator
• External oscilloscope (purchased separately)
• Frequency counter

Product features:

• Simple, lightweight mechanical layout for ease of use
• High magnetic-field homogeneity, enabling observation of 20+ resonance components
• Compact probe design for convenient sample exchange

Experimental details:

• Observe the NMR signal, accurately determine the static magnetic field B0 and estimate the error ΔB0
• Record the resonance of fluorine nuclei in a polytetrafluoroethylene (solid) sample and measure the associated g‑factor
• Estimate the resonance linewidth of fluorine nuclei in PTFE and calculate the transverse relaxation time T2

Experimental objectives:

• Understand the principles of nuclear magnetic resonance and observe NMR phenomena
• Learn NMR measurement methods and how to accurately measure magnetic fields using NMR
• Perform quantitative measurements to obtain basic nuclear parameters for 1H and 19F

Technical specifications:

• Signal-to-noise ratio: 100:1 (40 dB)
• Oscillating frequency: 17 MHz – 23 MHz (dependent on magnet)
• Frequency adjustment range: f_max / f_min = 1.5
• Typical measured samples (used in experiments): 1H — CuSO4 (sample #1); 19F — polytetrafluoroethylene (PTFE) (sample #2)