Spectroscopy

Spectroscopy uses light to probe molecular structure. Each technique reveals different information - together they can determine the complete structure of an unknown compound. Spectra are sourced from experimental measurements in the NIST Chemistry WebBook.

IR Spectroscopy

6 free molecules

Identify functional groups by clicking absorption peaks on real IR spectra. Watch bonds vibrate on 3D molecules.

1H NMR Spectroscopy

6 free molecules

Interpret chemical shifts, splitting patterns, and integration. Click peaks to highlight equivalent hydrogens on 3D molecules.

Mass Spectrometry

Coming soon

Analyze fragmentation patterns and molecular ion peaks. See which bonds break to form each fragment.

Learn the fundamentals

How IR Spectroscopy Works

Molecular vibrations, the four diagnostic regions, and a strategy for interpreting unknown spectra.

How NMR Works

Chemical shift, spin-spin coupling, integration, and a strategy for interpreting unknown spectra.