NMR Spectroscopy Lab
Peak assignment — Ethanol
Integral ratio 3:2:1 estimates relative proton counts; assignments are teaching ranges, not automatic structure proof.
Splitting tree: each modeled line branches by ±0.023 ppm at 7 Hz
NMR Spectroscopy Simulator — Interactive Spectrum & FID
This NMR simulator visualizes three aspects of nuclear magnetic resonance for four common organic molecules. The spectrum view draws ¹H NMR peaks at correct chemical shifts (ppm) with Lorentzian lineshapes and J-coupling satellite peaks when J > 0 Hz. The FID view shows the free induction decay as a decaying cosine with exponential envelope. The spins view animates 8 proton dots precessing in a circle around the B₀ field axis with Larmor frequency displayed. Adjust field strength from 1.00 to 14.10 T — the Larmor frequency scales linearly.
What you can do in this simulation
- Choose from Ethanol, Acetone, Benzene, and Ethyl Acetate presets
- Adjust B₀ field (1.00–14.10 T) and observe Larmor frequency change
- Set J-coupling constant (0–20 Hz) to see satellite peaks in spectrum
- Adjust T2 relaxation time to change FID decay rate
- Switch between Spectrum, FID, and Spins views
Concepts covered
nuclear magnetic resonance · Larmor frequency · chemical shift · J-coupling · free induction decay · spin precession
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