Precise measurement of the ground state (2P1/2–2P3/2) splitting of atomic chlorine by CO2 laser Zeeman spectroscopy

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Abstract
The 2P1/2–2P3/2 transition within the 2P ground state of atomic chlorine has been studied by the technique of laser Zeeman spectroscopy using a 13C16O2 laser line at 882.288 cm−1. The 2P1/2–2P3/2 splitting is measured to be 882.3519 ± 0.0012 cm−1 (weighted mean for the 35Cl and 37Cl isotopes), and this splitting is determined to be 28.2 ± 2 MHz larger for 37Cl than for 35Cl.