From the modern theoretical point of view [1] magnetic resonances in S=l/2 quasi 1D antiferromagnetic (AF) quantum spin chains should be treated as collective phenomena rather than diffusive spin dynamics suggested by exchange narrowing approach. In the case of EPR collective nature appears in dependence of the line width and g-factor on the microwave field B_(omega) orientation [1,2].
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机译：从现代理论的角度来看，S = L / 2准1D反铁磁（AF）量子旋转链中的磁共振应被视为集体现象，而不是通过交换缩小方法提出的扩散自旋动力学。在EPR集体性质的情况下，依赖于线宽和G型对微波场B_（OMEGA）定向的G型[1,2]。
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