Electron photodetachment from I ions has been observed using an optogalvanic technique in which an electrical discharge in iodine vapor was probed with a pulsed dye laser. The first photodetachment threshold, corresponding to the onset of production of I(2P3/2) atoms, was located at 405.18±0.02 nm giving for the electron affinity Ea(I) =3.0591±0.0001 eV.

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