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首页> 外文期刊>Zeitschrift fur Physik, B. Condensed Matter >Band gap variation in laser irradiated polytypic crystals of cadmium iodide
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Band gap variation in laser irradiated polytypic crystals of cadmium iodide

机译：碘化镉激光辐照多型晶体的带隙变化

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摘要

Highly purified single crystals of cadmium iodide obtained through repeated zone refining have been subjected to laser beam exposure (Argon ion laser), both for various time durations and to various beam intensities., and then subjected to band gap determination by UV spectroscopy. The band gap has been found to decrease gradually with increase in the laser beam intensity, whereas its variation with increase in time of exposure shows an unusual behaviour such that it initially falls sharply followed by a gradual rise back to its original value. The results have been analysed and interpreted in terms of indirect band gap character of the material and an unusual variation in phonon frequency. The interpretation is well supported by X-ray diffraction and scanning electron microscopy (SEM) studies.
机译：通过重复区域精炼获得的高纯度碘化镉单晶已经经受了各种时间段和各种束强度的激光束曝光（氩离子激光），然后通过紫外光谱法进行了带隙测定。已经发现，带隙随着激光束强度的增加而逐渐减小，而其带隙随着曝光时间的增加而变化，表现出不寻常的行为，使得其最初急剧下降，然后逐渐上升回到其原始值。已经根据材料的间接带隙特性和声子频率的异常变化对结果进行了分析和解释。 X射线衍射和扫描电子显微镜（SEM）研究很好地支持了这一解释。

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