Hydrogen bromide: Constants of diatomic molecules by Klaus P. Huber and others

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.