Abstract
The total absorption cross section and photoionization yield of molecular iodine were measured from 1050 to 2200 Å. Two thresholds were observed in the photoionization yield curve. The first was associated with the ion-pair production I+ + I− and the second to direct ionization of I2. From the appearance potential for ion-pair production and the accurate ionization potential of I2 it was possible to calculate the value of the electron affinity of iodine, namely, 3.073 ± 0.014 eV.
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