The hyperfine structure (hfs) of the A2Π excited state of Ca35Cl has been investigated by using the new rf-pumped, laser-rf double-resonance technique. The optically unresolved hfs components of the R2 (N″ = 101), A ↔ X (0, 0) line were resolved by double resonance, and the measured splittings, when combined with the known X2Σ+- state hfs spacings, show that the A2Π -state hfs splittings are not more than 1 MHz.
© 1982 Optical Society of America
W. J. Childs, David R. Cok, and L. S. Goodman, "Hyperfine structure of the A 2Π state of Ca35Cl," J. Opt. Soc. Am. 72, 717-719 (1982)