The electronic spectroscopy and photodissociation dynamics of the I3 radical are investigated with two experimental methods. The ground and several low-lying excited states of the I3 radical are characterized by photoelectron spectroscopy of I3 at 213 nm. Assignments of these states are discussed with reference to recent calculations. In addition, photodissociation of the I3 radical was investigated at selected photon energies (4.59, 4.96, and 5.17 eV) by fast radical beam photofragment translational spectroscopy. Two product channels were observed with mass ratios of 1:2 and 1:1, and translational energy (P(ET)) distributions were measured. The P(ET) distributions for products with mass ratio 1:2 show that this channel corresponds to I2 in various electronic states along with atomic I in its P3/22 or P1/22 state. The 1:1 channel corresponds primarily to concerted three-body dissociation to three I atoms.

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