The absorption spectra of large single crystals of Er2O3observed at 10deg;, 80deg;, and 290deg;K were analyzed in the 2200ndash;10 000hyphen;Aring; wavelength region. Over 600 transitions from all eight crystalline Stark levels of the ground4I15/2state to over 30 excitedJmanifolds of the Er3+ion inC2sites were assigned. In thick crystals, evidence of vibronic spectra of ions inC2andS6sites was observed for sevenJmanifolds. The observed spectrum is compared with a calculation which includes configurationhyphen;interaction effects on all expected ``freehyphen;ion'' energy levels of Er3+between the ground state and 44 000 cmminus;1. The parametersE1=6844,E2=32.04,E3=635, zgr;=2354, agr;=12.2, bgr;=minus;590, andY(22, 1)=minus;4180 cmminus;1yield an rms deviation of 73 cmminus;1between observed and calculated energy levels. The significance of these parameters in comparison with those for Er3+in other crystals is discussed.
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