Double-resonance methods in gases, with application to OCS

Abstract

We present a systematic derivation of and a few corrections to the theory on double resonance given by Autler and Townes. We discuss the range of validity of this theory and show its relation with the theory formulated by Di Giacomo. In addition, a critical comparison of both theories with experimental results is given. In these experiments the J = 1, 2 l-type doublets of OCS have been studied: the microwave absorption spectrum is determined in the presence of a radio-frequency field. The influence of the parameters of the microwave and the radio-frequency field on the fine structure of the microwave absorption spectrum is studied. The agreement between theories and experiment is satisfactory. The J = 1 and J = 2 l-doublet spacings of OCS are found to be 12.78 ± 0.01 MHz and 38.17 ± 0.01 MHz, respectively.