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arXiv · 2006.11322

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

K. -F. Lai·E. J. Salumbides·W. Ubachs
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Abstract

The $3p^{4}$ $^{3}$P$_{J}$ - $3p^{3}4p$ $^{3}$P$_{J}$ transition in the sulphur atom is investigated in a precision two-photon excitation scheme under Doppler-free and collision-free circumstances yielding an absolute accuracy of 0.0009 cm$^{-1}$, using a narrowband pulsed laser. This verifies and improves the level separations between amply studied odd parity levels with even parity levels in S I. An improved value for the $^{3}$P$_{2}$ - $^{3}$P$_{1}$ ground state fine structure splitting is determined at $396.0564$ (7) cm$^{-1}$. A $^{34}$S - $^{32}$S atomic isotope shift was measured from combining time-of-flight mass spectrometry with laser spectroscopy.

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K. -F. Lai, E. J. Salumbides, W. Ubachs. 2020-06-19. Two-photon Doppler-free ultraviolet laser spectroscopy on sulphur atoms. https://doi.org/10.1088/1361-6455/ab9c37

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