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

K. F. Lai, E. J. Salumbides, W. Ubachs*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


The 3p43PJ-3p34p3PJ 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 3P2-3P1 ground state fine structure splitting is determined at 396.0564 (7) cm-1. A 34S-32S atomic isotope shift was measured from combining time-of-flight mass spectrometry with laser spectroscopy.

Original languageEnglish
Article number175002
Pages (from-to)1-5
Number of pages5
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number17
Early online date8 Jul 2020
Publication statusPublished - 14 Sep 2020


  • isotope shift
  • laser spectroscopy
  • sulphur atom


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