Rare gas-iodine complexes in the ion-pair states

Luminescence and luminescence excitation spectra in the vicinity of the optical-optical double resonance transitions to the I(2)(f0(g)(+), v(f) = 8 and 9, J(f) approximate to 55) levels have been measured at the bulb conditions for the I(2) + Rg mixtures (Rg = He, Ar, Xe) at the rare gas pressures 2-20 Torr and room temperature. Luminescence attributed to the RgI(2) complexes in the f0(g)(+), F0(u)(+) and E0(g)(+) ion-pair states has been observed for the first time. It is argued that the complexes can be formed by direct optical excitation from the RgI(2)(B0(u)(+)) U complexes or {Rg + I(2) (B0(u)(+))} colliding pairs. Besides, the RgI(2) complexes in the f0(g)(+), F0(u)(+) and E0(g)(+) ion-pair states can be formed in nonadiabatic internal conversion processes from the RgI(2)(f0(g)(+)) one. The complexes have rather long lifetime, especially in the case of Xe, and decay radiatively and nonradiatively forming I(2) Molecules in different ion-pair states. (C) 2004 Elsevier B.V. All rights reserved.