Maser theory is developed in this chapter neglecting the spins of the transition states; that is, the maser levels are assumed scalar for simplicity. In this approximation the vector nature of the electric field is ignored, resulting in considerable simplifications. Most of the essential features of complete theory are preserved; the only important property lost is polarization, discussed separately in chapter 6.
KeywordsExternal Radiation Saturated Zone Radiative Transfer Equation Maser Theory Maser Level
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