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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Zheng, Wen-Chen Yang, Yu-Guang Mei, Yang Liu, Hong-Gang |
| Description | Author Affiliation: Zheng WC ( Department of Material Science, Sichuan University, Chengdu 610064, PR China. zhengwc1@163.com) |
| Abstract | Based on the defect models that the tetragonal Y(2+) (1) center in the irradiated CaF(2): Y crystal is due to Y(2+) at Ca(2+) site associated with a nearest interstitial F(-) ion along C(4) axis and the tetragonal Y(2+) (2) center is Y(2+) at Ca(2+) site where the tetragonal distortion is caused by the static Jahn-Teller effect, the two optical spectral bands and anisotropic g factors for both tetragonal Y(2+) centers are calculated. The calculations are made by using two methods based on the cluster approach, one is the complete diagonalization (of energy matrix) method (CDM) and another is the perturbation theory method (PTM). The calculated results for each Y(2+) center from CDM and PTM coincide and show reasonable agreement with the experimental values. The calculated isotropic g factor for Y(2+) (2) center at higher temperature owing to the dynamical Jahn-Teller effect is also consistent with the observed value. The defect structures (i.e., tetragonal distortion) of the two Y(2+) centers are obtained from the calculation. It appears that both theoretical methods can be applied to explain the optical and EPR data, to study the defect model and to determine the defect structures for d(1) ions in crystals. |
| ISSN | 13861425 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Volume Number | 97 |
| e-ISSN | 18733557 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-11-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Calcium Fluoride Chemistry Optical Phenomena Crystallization Electron Spin Resonance Spectroscopy Ions Journal Article Discipline Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation |
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