Resonant optical excitation of the I2 ion-pair states through the RgI2 complexes in the valence states correlating to the 2P1/2+2P1/2 limit

The luminescence spectra of I-2(beta 1(g),v(beta) <= 59 and D0(u)(+) v(D) <= 61) ion-pair states are observed in I-2 + Rg mixtures after irradiation by Nd:YAG (1064.48 and 532.24 nm) laser beams. Luminescence excitation is attributed to two-step 1064.48 + 532.24 nm pumping of RgI(2) complexes in 0(g)(+) and 1(u) valence states correlating to third valence dissociation limit P-2(1/2) + P-2(1/2). Subsequent decay of the complexes gives free I-2(1(u), 0(g)(+)) molecules, which are excited to the beta I-g and D0(u)(+) states by third 532.24 nm photon. This mechanism conforms all experimental findings and provides the first indication for optical population of the R912 complexes in the valence states different from the B0(u)(+) and X0(g)(+). (c) 2006 Elsevier B.V. All rights reserved.