THE $\nu_{2}$ AND $\nu_{3}$ BANDS OF $H_{2}D^{+}$ AND $D_{2}H^{+}$

$^{1}$J.-T. Shy, Ph.D. Thesis, University of Arizona (1982); J.-T. Shy, J.W. Farley, and W.H. Wing, Phys. Rev. A 24, 1146 (1981). $^{2}$T. Amano and J.K.G. Watson, J. Chem. Phys. 81, 2869 (1984); K.G. Lubic and T. Amano, Can. J. Phys. 62, 1886 (1984). $^{3}$For example: G.D. Carney, Can. J. Phys. 62, 1871 (1984).Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada; Herzberg Institute of Astrophysics, National Research Council of Canada; Herzberg Institute of Astrophysics, National Research Council of CanadaExtensive diode laser spectra of $H_{2}D^{+}$ in the $2000-2500 cm^{-1}$ region and of $D_{2}H^{+}$ in the $1800-2300 cm^{-1}$ region have been recorded. These data are supplemented by difference-frequency laser measurements on $H_{2}D^{+}$ by Crofton and Oka, and by ion beam measurements on $D_{2}H^{+}$ by Shy and $Wing.^{1}$ For both isotopes the $\nu_{2}$ and $\nu_{3}$ vibrations are strongly coupled by a Coriolis interaction, and the bands must be analyzed simultaneously; these analyses have now been accomplished. Previous $studies^{2}$ of the $\nu_{1}$ bands were very helpful in providing ground state combination differences to confirm our assignments. For $H_{2}D^{+}$, over 60 transitions have been assigned and fitted with a standard deviation of about $0.008 cm^{-1}$, and for $D_{2}H^{+}$ the numbers are similar. The resulting molecular parameters are in good general agreement with ab initio $calculations.^{3}