A new laser line of CH3F at 676 mum has been found. The gas was pumped
by a powerful pulsed CO2 laser at 9P20. The line could be observed si
multaneously with the 496 mum line and can be assigned to a rotational
transition in the 2nu3 band which is stepwise pumped from the vibrati
onal ground state via the nu3 = 1 state.