The Analysis of the Hydrogen Sulfide Band at 10,100A

Details of the measurement and procedure of analysis of the ${\nu }_{\sigma }+3\mathrm{}{\nu }_{\pi }$ band of ${\mathrm{H}}_2$S are given. An approximate correction for the rotational distortion of the molecule is included. Assignments are made which satisfactorily account for 84 of the 91 measured lines. The remaining 7 lines are considered spurious. The theory for a rigid rotator plus the distortion correction gives a very good approximation to the rotational energy levels of the ${\mathrm{H}}_2$S molecule, but many deviations are observed which are definitely larger than the experimental error. The moments of inertia in the normal vibrational state are 2.667, 3.076, 5.845×${10}^{-40\mathrm{}}$ g ${\mathrm{cm}}^2$, the axis of least inertia being perpendicular to the symmetry axis of the molecule. The bond angle is 92° 20′ and the H—S distance 1.345A.