Working Principles of the Optical Detection Methods of ESR, ENDOR, and ZF-ENDOR for the Relaxed Excited State of the F Centers

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Qualitaitve explanation of working principles of the optical detection (OD) methods of ESR, ENDOR and ZF-ENDOR for the study of the relaxed excited state (RES) of F centers are presented. The ZF-ODENDOR method is a sort of the ENDOR technique measured without sending any resonant elelctromagnetic waves. It had been developed in Jaccard's school. They have observed a few series of signals due to the super hyperfine (shf) interaction in the ground state (GS), when the F centers in KCl are excited optically. We propose a working principle of ZF-ODENDOR, and predict that shf signals of the RES can be measured. After improving the ZF-ODENDOR method, Akiyama and Ohkura in the Okayama University of Science have observed the shf constants in the RES, with which they have determined the envelope function of the RES of the F centers in KCl. This verifies the vibronic scheme of the RES proposed by us previouly.
岡山理科大学の論文