Триплеттриплетная аннигиляция молекулярных электронных возбуждений вблизи диамагнитной металлической микрочастицы в переменном магнитном поле

Abstract

A mathematical model of the spinselective reaction of triplettriplet annihilation of molecules on the surface of a spherical microparticle or a cylindrical rod of micrometer radius in an alternating magnetic field transformed by conducting microparticles is presented. Based on these models, the calculations of the integral and local rates of magnetically sensitive molecular processes were performed. It has been shown that in the local nearsurface regions of the conducting microparticles in an alternating magnetic field, the rate of spinselective bimolecular reactions changes. The comparison of the nanoand microsphere showed that with the external magnetic field induction value B0 = 1 T, the maximum resulting field at the equator of the particle was equal to 12 mT and 100 mT, respectively. It was also revealed that for nanoand microcylinders with a similar value of the external magnetic field induction B0 = 1 T, the maximum resulting field at the point (R,0) of the 2d magnetic pole was equal to 12 mT and 1.5 T, respectively. The amplitude of the magnetic effect for different times and particle sizes was equal to +1 % and 2 %. For a silver microcylinder with a radius R = 25 μm, there was switching from a purely negative magnetic effect at the time t = 0 ns to an effect with positive and negative parts. For the case of a silver cylinder of radius R = 30 μm and external magnetic field frequency ω = 5∙108 s1, an increase in the amplitude of the positive part of the magnetic effect curve from 0.25 % to 1 % was observed when the time instant changed from t = 0 ns, which corresponds to the maximum of the external magnetic field, up to t = 3.68 ns when the resulting field of the microwire reaches its maximum. This work may be of interest to physicists and chemists involved in science in the field of chemical physics, physics of magnetic phenomena, spinselective reactions and spintronics.