1. 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 Kraków, Poland
2AGH University of Science and Technology,
Academic Center for Materials and Nanotechnology
Av. A. Mickiewicza 30, PL Kraków, Poland
3RENON
ul. Gliniana 15/15, PL 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 R
XI OSSM-2016, czerwca 2016 r., Turno koło Radomia

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

3. 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.

4. 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

5. Geometry of the experiment

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

7. Experimental setup

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

9. Test of the transducer linearity

10. Spectra

11. Results for polycrystalline foil
Parameter
Value

12. 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: (2015) : Journal of Alloys and Compounds 673, (2016)