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The molecular structure of thioxanthone has been determined from gas electron-diffraction data. The molecular parameter values and their uncertainties are rg(C–C)=1.401±0.001 Å, rg(C–H)=1.099±0.007 Å, rg(C–S)=1.751±0.002 Å, rg(C–Cc)=1.498±0.004 Å, rg(Cc–O)=1.232±0.006 Å, ∠CSC=103.4±0.3°, ∠CCcC=119.4±0.6°, and θ(dihedral angle)=169.0±1.6°, where the angle parameters are rα parameters. The dihedral angle of thioxanthone is much larger than those of related molecules.

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