title: Ketenimines
text: # Ketenimines
  
  Ketenimines are a group of organic compounds sharing a common functional group with the general structure $R^1R^2C=C=NR^3.$ A ketenimine is a cumulated alkene and imine and is related to an allene and a ketene.
  
  The parent compound is ketenimine or $CH_2CNH.$ The most recent work by Bane et al. investigates the rovibrational structure of the $ν_8$ and $ν_{12}$ bands in the high-resolution FTIR spectrum, complementing the earlier analysis of the pure rotational spectrum. This pair of Coriolis coupled bands provide a rare example where intensity sharing between bands yields sufficient intensity for an otherwise invisible band $(ν_{12}).$
  
  