JOURNAL OF MOLECULAR SPECTROSCOPY 188, 102–105 (1998) ARTICLE NO. MS977496 C-13 Methanol Far-Infrared Laser: Newly Discovered Lines, Predictions, and Assignments

We report 25 new laser lines from 13CH3OH methanol when pumped by a cw CO2 laser. The majority of the lines are pumped by the 10R (regular) and 10SR (sequence) bands of the CO2 laser. Two are pumped by the 9HP(20) hot-band CO2 line. We measured 22 laser frequencies in this molecule, 19 from new lines and three from previously reported lines. We also remeasured and corrected the frequency of the 9P(44) pumped line as 3 378 404.87 MHz (88.738 mm). We assigned two lines—10SR(17), 77.5758 cm01 and 10R(50), 119.3020 cm01—and predicted other potential far-infrared laser lines with these two pumps. q 1998 Academic Press 1. INTRODUCTION The FI