Experimental confirmation of ground state isotopic isomerization from OC⋯HI to OC⋯ID

Abstract The ν 1 spectra of 16 O 12 C-DI and 16 O 12 C-ID, as well as ν 2 of 16 O 12 C-DI, 16 O 12 C-ID have been recorded using a quantum cascade laser pulsed slit supersonic jet spectrometer. Intensity measurements made simultaneously in the same expansion for transitions in ν 2 16 O 12 C-HI: 16 O 12 C-IH and ν 1 16 O 12 C-DI: 16 O 12 C-ID isomers permit determination of the isomerization for the former pair to be +2.8(1.0) and the latter −6.0(1.0) cm −1 . These results confirm prediction of ground state deuterium isotopic isomerization made using a generated morphed potential. Further analyses indicate OC . HI is a prototype for complexities associated with isomerization and isotopic effects in excited stretching vibrations.