μ -Mesonic Atom Studies of Ti, Fe, Cu, Zn, Tl, Pb, and Bi

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This paper presents the results of a precision re-evaluation of the μ-mesonic x-ray transition energies for Tl, Pb, Bi, Ti, Fe, Cu, and Zn. The 2p-1s and 3d-2p transition regions were studied for Tl, Pb, and Bi, and the $2p$ fine structure splitting was determined with good precision from both sets of measurements. The Tl, Pb, and Bi transition energies were determined to about 0.2%, while the $2p$ state fine structure splitting was determined to within 2 to 3%. The results are in good agreement with the theoretically predicted values of Ford and Wills, based on the charge distributions implied from the high-energy electron scattering experiments. An anomaly in the observed intensity ratio of the 2p1/2-1s to 2p3/2-1s transitions for Bi and Tl is discussed. It is believed to be due to an excitation of the first excited state of the initial nucleus. The observed 2p-1s transition energies for Ti, Fe, Cu, and Zn are given, with experimental uncertainties of 0.2 to 0.3%. The comparison with the theoretically predicted values is much improved relative to the earlier experimental results.