Crystalhyphen;field parameters appropriate forS4symmetry were fit to the4I9sol;2and4I11sol;2sublevel splitting of Nd3plus;in PbMoO4. Intermediate coupling wavefunctions were used.Jsngbnd;Jmixing between the4I9sol;2and4I11sol;2states was considered. The values found are (in cmminus;1):B02thinsp;equals;thinsp;662.5, B04thinsp;equals;thinsp;minus;thinsp;690.0, B06thinsp;equals;thinsp;minus;thinsp;84.4, B44thinsp;equals;thinsp;minus;thinsp;984.2, B46thinsp;equals;thinsp;minus;thinsp;600.0, B4prime;4thinsp;equals;thinsp;minus;thinsp;6.0, andB4prime;6thinsp;equals;thinsp;minus;thinsp;0.8. The rms deviation of this fit was 4.8. We calculate groundhyphen;stategpar;andgperp;values of 1.283 and 2.585; experimentally these are 1.351 and 2.592. By changing theBmnslightly we obtain 1.348 and 2.586.
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