Band gap variation in laser irradiated polytypic crystals of cadmium iodide |
| |
Authors: | A Nayak GL Bhalla GC Trigunayat |
| |
Institution: | (1) Department of Physics and Astrophysics, University of Delhi, Delhi-110 007, India, IN |
| |
Abstract: | 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.
Received: 26 May 1997 / Revised: 6 August 1997 / Accepted: 15 September 1997 |
| |
Keywords: | PACS 78 20 -e Optical properties of bulk materials and thin films - 78 70 -g Interactions of particles and radiation with matter |
本文献已被 SpringerLink 等数据库收录! |