Feasibility ofλ= 16μstimulated emission from a pulse-periodic DF–CO₂chemical laser

Abstract

From a study of the EPR of Mn" in K,SO, as a function of temperature, Chowdari and Venkateswarlu reported a possible phase transition at 143 K. To test whether a phase transisition really occurs, the spectra due to Mn2+ in K,SO, have been re-examined in our laboratory as a function of temperature. It was found that the Mn2+ ions occupy two sites, which are quite different from those proposed by Chowdari and Venkateswarlu, and these have been identified and analysed in detail at 4.2, 77 and 300 K at both Xand Q-band frequencies. The variation of the spin hamiltonian parameters B: and B i for the site with the stronger spectrum has been determined throughout the temperature range 4.2-300 K. No evidence for any phase transition was found.