ASSIGNMENTS OF FIR LASER LINES FROM OPTICALLY PUMPED (CH3OH)-C-13

We have revisited the assignments of the far-infrared laser lines emit ted by (CH3OH)-C-13 by comparing the laser systems to a high resolutio n Fourier transform absorption spectrum of (CH3OH)-C-13. The absorptio n spectrum was analyzed by means of the ''Ritz'' program, which calcul ates the energy level values directly from the Rydberg-Ritz combinatio n principle. We report new assignments for 11 FIR laser transitions, 1 7 frequency predictions for new possible laser lines, and we confirm 1 1 previous assignments. (C) 1996 Academic Press, Inc.