He I alpha photoelectron spectra have been measured for the I - 5p 6 shell of all diatomic alkali iodides for emission at 90 degrees and 26 degrees to an unpolarised photon beam. 2 P 3/2 : 2 P 1/2 branching ratios are reported for these angles. By assuming an asymmetry parameter for ionisation to the 2 P 3/2 state of I values are calculated for ionisation to the 2 P 1/2 state and absolute branching ratios are found. Results calculated in this way are discussed in terms of existing measurements for the equivalent states of xenon and of the ionic/covalent character of the iodide.
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Potts et al. (1984) studied this question.
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