The absorption and emission spectra of YAlO3:Er3plus;were recorded photographically in the spectral region 12 000ndash;40 000 cmminus;1. Catalogs of the absorption and emission lines are presented; line strength data are given for the absorption lines. From these spectra, 104 energy levels of YAlO3:Er3plus;from 0 to 40 000 cmminus;1were deduced and are presented. These comprise the crystal field components of 22 of the 24 Er3plus;free ion levels occurring below 40 000 cmminus;1. A free ion calculation was carried out. The free ion parameters that minimize the rms deviation between calculated and observed centers of gravity areE1equals;6786.3,thinsp;E2equals;32.415,thinsp;E3equals;643.27,thinsp;zgr;equals;2380.7,thinsp;agr; equals;21.721,thinsp;bgr; equals;minus;683.43, and ggr;equals;389.03 cmminus;1. Reasons for the absence of the2P1sol;2and4G5sol;2lines from the absorption data are discussed.
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