Keywords : EPR


Hussien Ali Noor

journal of al-qadisiyah for pure science(quarterly), 2017, Volume 17, Issue 1, Pages 21-25

Anthracites are considered as raw materials for the production of fullerenes, and the radiospectroscopy
method is proposed for express diagnostics of carbonic materials. In this work the features of the influence exerted by sizes, forms, and structures of anthracite samples on EPR signals are studied. It has
been demonstrated that the features of the recorded EPR spectra for the coals exhibiting high degrees
of metamorphization are associated with high concentrations of the localized spins at the recording
conditions and also with the peculiarities of their spatial-temporal localization within the fullerene-like
structures of the coals.


Hussien Ali Noor

journal of al-qadisiyah for pure science(quarterly), 2016, Volume 16, Issue 4, Pages 93-100

This work presents the experimental conditions leading to changing of the line form in
electron paramagnetic resonance (EPR) spectra when the extreme properties (line width and intensity) of
the object diagnosed are combined with different spectrum recording modes. A change in the line form on
recording in the standard mode with the automatic control of a microwave oscillator over the measuring
cavity is characteristic for samples with high concentrations of the paramagnetic centers. As the EPR signal
intensity is growing, first the line width and symmetry is varying monotonically with a transition to the
”dips”«the disruption», and then а hysteresis is revealed for the spectral lines recorded on increasing and
decreasing of a magnetic field.