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

Abstract

The ²P_1/2–²P_3/2 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 ²P_1/2–²P_3/2 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.