IMPROVED ANALYSIS OF THE INFRARED-SPECTRUM OF D2H+

The rotational analysis of the Coriolis-coupled ν2/ ν3 bands in the infrared spectrum of the D2H + molecular ion has been reexamined. By making four reassignments and adding one new transition, it has been possible to achieve a much better fit of the bands using fewer molecular parameters. The reassigned ν2/ ν3 data were combined in a simultaneous least-squares analysis with existing ν1 band infrared data and with two newly measured pure rotational transitions. The resulting molecular parameters and calculated energy levels are the best currently available for this fundamental molecular ion. © 1990 American Institute of Physics.