Broadening of CH3F in presence of Stark fields. I. Self-broadening and self-shifting of isolated components

Self-broadening and shifting of methyl fluoride CH312F have been investigated in the 50–408 GHz range for the rotational transitions J=0→1, J=1→2, J=2→3, J=5→6, and J=7→8 and for their ΔM=0 and ΔM=±1 Stark components, as they were resolved by an appropriate field. The different results obtained for M-degenerated and M-resolved cases, as well as the M dependence of the results has been interpreted theoretically within semiclassical perturbative approximations. Evidence of collisional coupling effects between Stark components was obtained.