The IR transmission spectrum of the irradiated and unirradiated doped corun
dum is analyzed in this paper. Three new IR peaks have been found. The peak
s notably intensified in the spectrum of proton irradiated sample. However,
in the spectrum of the sample irradiated by an atomic reactor, the peaks o
f the doped Cu sample notably intensified only. It shows that the (OH)(-) v
ibration and cation void in the crystal relate the peaks. It is concluded t
hat the doping Cu in the crystal would affect seriously the crystal quality
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