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The $3p^{4}$ $^{3}$P$_{J}$ - $3p^{3}4p$ $^{3}$P$_{J}$ transition in thesulphur atom is investigated in a precision two-photon excitation scheme underDoppler-free and collision-free circumstances yielding an absolute accuracy of0.0009 cm$^{-1}$, using a narrowband pulsed laser. This verifies and improvesthe level separations between amply studied odd parity levels with even paritylevels in S I. An improved value for the $^{3}$P$_{2}$ - $^{3}$P$_{1}$ groundstate fine structure splitting is determined at $396.0564$ (7) cm$^{-1}$. A$^{34}$S - $^{32}$S atomic isotope shift was measured from combiningtime-of-flight mass spectrometry with laser spectroscopy.

Two-photon Doppler-free ultraviolet laser spectroscopy on sulphur atoms