The Infrared Bands and Molecular Constants of HBr

The fundamental band of HBr has been remeasured, and the harmonic band examined for the first time under high resolution. From the equations representing line positions the values ${\nu }_0=2649.74\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $I_0=3.2634\mathrm{}\times {10}^{-40\mathrm{}}$ g ${\mathrm{cm}}^2$, and $r_0=1.4096\mathrm{}\times {10}^{-8\mathrm{}}$ cm are obtained. Resolution of the isotopic components was just possible in the fundamental band, and the observed separations agree with those computed from the isotopic masses of Br.