Microwave Resonance in Zero Magnetic Field

If the separation among the sublevels is in the range of microwave frequency, sublevel properties can be obtained by observing the effect of microwave resonance on the emission from this state. The zero-field splitting is of the order of microwave frequency for most of rr/r states. Thus, the sublevel properties can be obtained by analyzing the effect of microwave resonance on the phosphorescence intensity. The method is called phosphorescence-microwave double resonance (PMDR) or optical detection of magnetic resonance (ODMR). 

The information that can be obtained from this method is as follows a) zero-field splitting, b) decay rate constants for individual sublevels, c) relative radia- 

The method has been discussed in a number of textbooks and review articles [9-13], and therefore we are not going to discuss it here any further. 

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