Sign ambiguity in dipole moment derivatives of Br₂CO

Abstract

Signs of the dipole moment derivatives, ∂p_x/∂S₄ and ∂p_x/∂S₅ where p_x is the dipole moment vector along an axis perpendicular to the C=O bond in the plane of the molecule and S_j are the symmetry coordinates for the B₁ vibrations of Br₂CO have been re-evaluated from the reported ∂p/∂Q_i values (p being the dipole moment of the molecule and Q_i the normal coordinates) and the L matrix elements. The new set of dipole moment derivatives fits well with similar parameters for Cl₂CO and F₂CO.