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Solid state three-level masers operating with zero magnetic field are shown to be feasible and to have advantages over magnetic field masers in many applications. The requirements of the working substance are discussed and it is found that compounds of CrH, Fe3+, NiH, and Gd3+ should be suitable. Diagrams and tables of maser properties of selected compounds are given; on the basis of present knowledge a number of amplifying frequencies between 120 and 75,000 Mc/s should be available. The range of suitable compounds which has been studied is very small, and should be extended.

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