抄録
Earlier experimental work (J. Ferguson, H. J. Guggenheim and Y. Tanabe, J. appl. Phys. 36 (1965) 1046, Phys. Rev. Letters 14 (1965) 737) on the Mn pair spectrum of KZnF3:Mn and the spectrum of KMnF3 has been extended. The narrow bands of KMnF3 and RbMnF3 have been assigned and their abnormally high intensities established. The transition is an electric dipole one and oscillator strength (∼9.5×10−7 for the 4000 Å absorption) is temperature independent, corresponding to an allowed transition.
The experimentally observed features of the pair absorption suggest a possible form of interaction between radiation and paramagnetic ion pair. The origin of this interaction is discussed and an order of magnitude argument is given to support the proposed mechanism. Related problems such as exchange interaction in excited states and the spectra of the concentrated materials are also considered.
