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Relative muon capture probabilities for the individual elements of compounds and relative muonic x-ray intensities have been measured for a series of ionic solids and some related elements. Marked similarities are observed in relative K and L series intensities of a single ionic species. independent of bond partner (eg. Cl in NaCl and CaCI 2 ). However. significant K series differences are observed for an element in an ionic versus a covalent situation (eg. Cl in NaCl and in NaC10 4 ), with the higher K x-rays from the covalently bound element showing relative enhancements of as much as a factor of two over the ion. The measured intensities have been compared to the predictions of a meson cascade code, which allows variation in the nuon initial principal quantum meml;>cr (Nf.J) and the parameter a in the commonly used modificd statistical angular momentwn distribution. P(£) = (29-+ 1) exp (a9,).The fit was quite insensitive to the choice of Nf..l (in the neighborhood Nf..l == 17) but the results could not be well fitted with a single value of a. The atomic capture probabilities predicted by recent calculations do not fit the data noticeably better than the Fermi-Teller "2-Law".

Muonic Lyman-series x~ray spectra have been measured for several isoelectronic and isostructural molecular series and related pure elements. Seven muonic Iurman series lines were observed from liquid argon with relative intensities consistent with neighboring isoelectronic ions, but in stark contrast. to the single line previously reported for a gaseous argon target. The measured relative capture •rates and Lyman intensity correlations provide new evidence for chemical structure influences on the capture of negative muons.

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