A concise new look at the l-type spectrum of H12C14N

In response to our recent astrophysical discovery of highly excited circumstellar (HCN)-C-12-N-14 gas via direct l-type transitions, we have conducted comprehensive and precise laboratory measurements of those transitions (v(2) = 1, DeltaJ = 0). The newly measured transitions cover the J-values from 15 < J less than or equal to 35 and span the frequency range from 53 to 279 GHz. In addition, these new laboratory data are complemented by precision recordings of three medium DeltaJ = 1 (R-branch) transitions with J = 19, 20, and 21 near 2 THz in the ground vibrational and the v(2) = 1 bending state. Third, we supply the v(2) = 1 vibrational satellites between 440 and 980 GHz of 5 less than or equal to J(u) less than or equal to 11. The latter measurements were carried out in sub-Doppler resolution. All these new data are highly relevant to astrophysics.