Isotopic Determination of the Vibrational Numbering for the B3Π0+u State of Iodine

Abstract
A measurement of the vibrational isotope displacements between 127I2 and 129I2 has confirmed the revised vibrational numbering of the B3Π0+u state proposed by Steinfeld et al. They have observed that the traditional numbering must be decreased by one unit to bring their calculated fluorescence intensity distributions into agreement with experiment.