Abstract
Circular dichroism (CD) spectra were observed for the doubly superposed film–film and solution–solution samples, which all contained magnetically oriented achiral iron oxide magnetic nanoparticles (MNPs). The observed CD spectra critically depended on the angle difference, Δθ, between the orientation axes of MNPs in the superposed samples, giving the maximum CD value at the angle of Δθ = 45°. In a single solution cell sample with doubly superposed magnetic fields also, similar CD spectra depending on the angle difference between the magnetic fields were observed. These observed CD spectra were successfully reconstructed from the observed linear dichroism (LD) and linear birefringence (LB) spectra of each sample by the use of a superposed Mueller matrix method. Furthermore, triply and quadruply superposed solution samples exhibited the maximum CD spectra at the angle differences of Δθ = 30 and 22.5°, respectively, as suggested by the superposed Mueller matrix calculation. Thus, the origin of all CD spectra observed for the superposed achiral MNP samples has been quantitatively assigned to the helical combinations of LD and LB spectra of the magnetic field-induced optically oriented MNPs.
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