Rotational spectroscopy of HCl and DCl: A reanalysis based on the non-Born–Oppenheimer effective Hamiltonian

Rotational emission spectra of HCl and DCl were observed with a Fourier transform spectrometer. A data set of 103 newly observed rotational lines, combined with the rotational and vibrational–rotational lines reported in the literature, was analyzed by fitting the data to a non-Born–Oppenheimer effective Hamiltonian expressed with the optimal parameters, i.e., the determinable clusters of expansion coefficients [H. Uehara, Bull. Chem. Soc. Jpn. 77 (2004) 2189]. Full internal consistency of the results of this analysis demonstrates the validity of the present universal scheme for determination of the physically significant parameters defined by the effective Hamiltonian.