Laser-induced changes in the electron density distribution of crystals: Ca3Cr2Si3O12 |
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| Authors: | Haruo Sawada Masayasu Tokonami |
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| Affiliation: | (1) Mineralogical Institute, Faculty of Science, University of Tokyo, Hongo, Tokyo 113, Japan;(2) Present address: Department of Earth Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156, Japan |
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| Abstract: | Difference of electron density distribution between a crystal being He–Ne laser-irradiated and non-irradiated has been investigated by in situ X-ray diffraction methods. Difference Fourier analysis between these data revealed electron density decrease of 2.1 eÅ–3 at the trivalent site occupied 64% by Cr3+, the absorbant; while the calcium, silicon, and oxygen sites remained practically unchanged. Crystal data: [Natural uvarovite from Outokumpu, Finland; Ca3(Cr1.284Al0.692Fe0.024)Si3O12 (EPMA analysis); Cubic garnet structure; ;Z=8;a0=11.936(1) Å;V=1700.5 Å3Dx=3.775 Mgm–3;  (MoK )=0.71069 Å;  =4025 m–1;F(000)=1900;T=293 K]. |
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