Knowledge Bank

Isotopic substitution and vibrational excitation shift the energy intervals between analogous sets of interacting states. The effects on the spectrum can be dramatic. In the case of HCNO, new information concerning a Coriolis resonance first became available through such effects. The ``tuning"" we have achieved so far involves the isotopically substituted species $H13CNO$, $HC15NO$ and/or excitation of at least one quantum of $v1$, $v2$, $v3$ or $v4$.