دورية أكاديمية
Polarization dependence of aragonite calcium L-edge XANES spectrum indicates c and b axes orientation.
| العنوان: | Polarization dependence of aragonite calcium L-edge XANES spectrum indicates c and b axes orientation. |
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| المؤلفون: | Metzler RA; Department of Physics and Astronomy, Colgate University , 13 Oak Dr., Hamilton, New York 13346, United States., Rez P |
| المصدر: | The journal of physical chemistry. B [J Phys Chem B] 2014 Jun 19; Vol. 118 (24), pp. 6758-66. Date of Electronic Publication: 2014 Jun 05. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Chemical Society Country of Publication: United States NLM ID: 101157530 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5207 (Electronic) Linking ISSN: 15205207 NLM ISO Abbreviation: J Phys Chem B Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Washington, D.C. : American Chemical Society, c1997- |
| مواضيع طبية MeSH: | Calcium Carbonate/*chemistry, Carbon/chemistry ; Models, Theoretical ; Oxygen/chemistry ; X-Ray Absorption Spectroscopy |
| مستخلص: | Calcium carbonate minerals are frequently found in biomineral structures and are the predominant mineral in invertebrates. While there are several calcium carbonate polymorphs, aragonite and calcite are the two most commonly found in biogenic systems. Currently, calcium L-edge X-ray absorption near-edge structure (XANES) spectra are used to distinguish between different calcium carbonate polymorphs, including calcite and aragonite, while oxygen and carbon K-edge XANES spectra are often used to determine the c axis orientation of a given calcium carbonate crystal. By doing a full analysis of the calcite and aragonite calcium L-edge XANES spectrum for both geologic and biogenic systems, we were able to show that aragonite has a polarization-dependent peak while calcite does not. Analysis based on both multiplet models and density functional calculations show how the polarization dependence arises from directional bonds between the calcium and oxygen atoms within aragonite. These data not only enable an interpretation of the aragonite calcium L-edge XANES spectrum but also the ability to determine the orientation of the c and b axes of aragonite crystals within a biomineral sample. |
| معلومات مُعتمدة: | Canada Canadian Institutes of Health Research |
| المشرفين على المادة: | 7440-44-0 (Carbon) H0G9379FGK (Calcium Carbonate) S88TT14065 (Oxygen) |
| تواريخ الأحداث: | Date Created: 20140523 Date Completed: 20150518 Latest Revision: 20140620 |
| رمز التحديث: | 20240628 |
| DOI: | 10.1021/jp503565e |
| PMID: | 24849383 |
| قاعدة البيانات: | MEDLINE |
Find this issue from the American Chemical Society | تدمد: | 1520-5207 |
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| DOI: | 10.1021/jp503565e |