Effects of neutron flux on the nano silica particles: ESR study

摘要

In this paper, we have comparatively studied the "electron spin resonance" (ESR) of SiO2 nanoparticles before and after neutron irradiation. From the comparative analysis of samples at the full sweep (sweep 5000 G at center field of 3300 G) in the same system, amount of defects were found to increase. At the field line around 3350 G, we found the free electron g species (g = 2.002) and determined that this situation is more sustainable than the other observed cases (the cases existing in values 2.5-3 and 3-5 of g-factor). Moreover, expanded section near g = 2.002 repeated with a sweep of 100 G and at two power due to microwave saturation effects has been studied.