A new FIR line of CH3OH

Using the CH3OH molecular energy levels data base management program, it wa s deduced that when a CH3OH laser is pumped by CO2-9P (16) line, there shou ld be a FIR laser line of 918 mu m wavelength which has not been report ed before, corresponding to a transition in a ground-state reversed three-leve l energy system. The spectrum of this new line was calculated by solving th e density matrix equations. Experimentally, the CH3OH FIR laser line of 918 mu m wavelength was obtained by pumping with a TEA-CO2 laser. The experime ntal results were in good agreement with the theoretical calculations.