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By Klaus P. Huber and Gerhard H. Herzberg. NIST Chemistry WebBook compilation of diatomic constants.

Cited row: ground $X{}^1{\Sigma }^{+}$ state of hydrogen bromide, ${\omega }_e=2648.975\mathrm{c}{\mathrm{m}}^{-1}$ and ${\omega }_e{x}_e=45.2175\mathrm{c}{\mathrm{m}}^{-1}$. The isotope designation in this table is H81Br. These constants characterize low vibrational levels; an exact global Morse potential is a further modelling assumption.

By Klaus P. Huber, Gerhard H. Herzberg.

Publisher: National Institute of Standards and Technology.

Online text: webbook.nist.gov/cgi/cbook.cgi?ID=C7647010&Mask=1000

Cited passages: HCl, ground electronic state diatomic constants: equilibrium internuclear separation 1.274552 Å; Huber and Herzberg compilation, HCl diatomic constants, note 35: 1.1085, 1.1390 and 1.1685 D for vibrational levels 0, 1 and 2; reference to Kaiser (1970).

By Klaus P. Huber and Gerhard H. Herzberg. NIST Chemistry WebBook compilation of diatomic constants.

Cited row: ground $X{}^1{\Sigma }^{+}$ state of hydrogen iodide, ${\omega }_e=2309.014\mathrm{c}{\mathrm{m}}^{-1}$ and ${\omega }_e{x}_e=39.6435\mathrm{c}{\mathrm{m}}^{-1}$. Higher anharmonic coefficients are also tabulated, so the two-constant Morse oscillator extrapolation should not be confused with a measurement of the actual dissociation threshold.