Abstract: We have measured the near-normal ordinary ray transmittance and reflectance of crystalline Al$-2$/O$-3$/ from 1.6 micrometer to 11 micrometer and temperatures from 296 K to 582 K. The absorptance, or emittance, is derived from 1-(T$PLU@R), where T and R are the measured transmittance and reflectance. The derived emittance curves are compared with the predictions of a multi-phonon model prediction. Generally, good agreement is found between the measured and predicted results in the region of the multi-phonon absorption edge. !10
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机译：摘要：我们测量了晶体Al $ -2 $ / O $ -3 $ /的近乎正常的普通光线透射率和反射率，从1.6微米到11微米，温度从296 K到582K。吸收率或发射率是从1-（T $ PLU @ R）导出，其中T和R是测得的透射率和反射率。将导出的发射率曲线与多声子模型预测的预测进行比较。通常，在多声子吸收边缘的区域中，在测量结果和预测结果之间找到了良好的一致性。 ！10
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