Absolute Infrared Intensities of Stannane

Abstract

The absolute gas‐phase infrared intensities for the triply degenerate vibrations of SnH₄ and SnD₄ are determined using the nitrogen pressure‐broadening technique. An analysis of the SnH₄ intensities yields alternative sets for the dipole‐moment derivatives in terms of the symmetry coordinates of the F₂ species: For ∂P_z/∂S₃, Set I is ±2.81±0.14 D/Å and Set II is ±2.66±0.14 D/Å; for ∂P_z/∂S₄, Set I is ±1.68±0.09 D/Å and Set II is ∓1.85±0.09 D/Å. A comparison with data for the other Group IV hydrides suggests a possible preference for Set I, the positive ratio for the relative sign combination of the stretching and bending dipole‐moment derivatives.