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Abstract
The structure of native Champsocephalus gunnari icefish otoliths, scales, teeth, bones and pristine hydroxyapatite (HA) were examined using Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy. NEXAFS Cls-absorption spectra of the selected icefish hard tissues indicate that otoliths contain anion [CO3]2-. NEXAFS P2p-spectra clearly indicate the absence of phosphorus atoms only within otoliths and scales samples. However, the icefish teeth and bones P2p-spectra demonstrate identical spectral feature typical for the HA. NEXAFS Ca2p-spectra of the icefish hard tissues studied also shows features, which are in good correspondence with HA spectra. Interestingly, there is a red shift ≈ 0.1 eV of the 2p1/2,3/2 → 3d transition energies in NEXAFS Ca2p-spectra of teethes and bones of the C. gunnari in comparison to HA.
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1 Institute of Physics and Mathematics, Komi Science Centre Ural Division, RAS, 167982, Syktyvkar, Russia
2 Institute of Physics and Mathematics, Komi Science Centre Ural Division, RAS, 167982, Syktyvkar, Russia; Syktyvkar State University, Syktyvkar, Russia
3 Institute of Earth Sciences, Department of Crystallography, St. Petersburg State University, St. Petersburg, Russia
4 Institute of Experimental Physics, TU Bergakademie Freiberg, Freiberg, Germany; European XFEL GmbH, Albert-Einstein-Ring 19, 22761 Hamburg, Germany
5 IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain; Departamento de Fisica de Materiales and CFM-MPC UPV/EHU, Donostia International Physics Center (DIPC), 20080 SanSebastian, Spain
6 Institute of Experimental Physics, TU Bergakademie Freiberg, Freiberg, Germany