Electric quadrupole interaction in cubic BCC α-Fe A. Błachowski1, K. Komędera1, K. Ruebenbauer1, G. Cios2, J. Żukrowski2, and R. Górnicki3 1Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University ul. Podchorążych 2, PL-30-084 Kraków, Poland 2AGH University of Science and Technology, Academic Center for Materials and Nanotechnology Av. A. Mickiewicza 30, PL-30-059 Kraków, Poland 3RENON ul. Gliniana 15/15, PL-30-732 Kraków, Poland Dr. Sc. Michael I. Oshtrakh, Ural State Technical University, Ekaterinburg, Russian Federation is warmly thanked for inspiring this research. This work was partly supported by the National Science Center of Poland, Grant No DEC-2011/03/B/ST3/00446 and by the European Regional Development Fund under the Infrastructure and Environment Programme. Development of the MsAa-4 spectrometer was partly financed by the Polish Ministry of Science and Higher Education under the Grant No R15-002-03. XI OSSM-2016, 19-22 czerwca 2016 r., Turno koło Radomia

Some iron properties G. Shen, H.-K. Mao, R. J. Hemley, T. S. Duffy, and M. L. Rivers, Geophys. Res. Lett. 25, 373 (1998).

Electric field gradient and electric charge density This is 5-parameter second order tensor field in the 3D Euclidean space parameterized below by using spherical coordinates. Electric field gradient (EFG) is traceless and symmetric tensor. It vanishes for cubic or higher charge symmetry. It has axial symmetry for three-fold or four-fold axis going through the point in question.

Structure of the cubic BCC α-Fe Chemical and magnetic unit cell magnetized in the easy direction with the SPIN-ORBIT coupling mechanism Hydrogen-like electron charge density 211 Hydrogen-like electron charge density 322

Geometry of the experiment

Excited state Hamiltonian: Ground state Hamiltonian: Properties of the transition: Resonant cross-section and transmission integral spectrum: Eventually:

Experimental setup

Interferometric calibration of the velocity scale by using He-Ne laser

Test of the transducer linearity

Spectra

Results for polycrystalline foil Parameter Value

Thank you very much for your attention A. Błachowski, K. Komędera, K Thank you very much for your attention A. Błachowski, K. Komędera, K. Ruebenbauer, G. Cios, J. Żukrowski, and R. Górnicki, arXiv: 1511.04933 (2015) : http://arxiv.org/abs/1511.04933 Journal of Alloys and Compounds 673, 420-425 (2016) http://dx.doi.org/10.1016/j.jallcom.2016.02.260