Reinterpretation of the emission spectrum of I2 in argon

TheA(3Π1) State of ClF

“…Accordingly, while the DЈ 3 AЈ system dominates the emission, 2 other electronic transitions are readily observed when they are spectrally removed from DЈ 3 AЈ (13,14). In a few cases, it has even been possible to discern bands of other transitions among the stronger DЈ 3 AЈ features.…”

Absolute Position of the D′2g(3P2) Ion-Pair State of I2 Determined by Perturbation-Facilitated Optical–Optical Double Resonance

“…The corresponding emission, which can be observed in a discharge of I 2 in the presence of inert buffer gases, has been historically known as the D -A system (3). However, the emission spectrum is heavily congested due to the high density of the states.…”

“…Even though the spectroscopic resolution was not sufficient enough to permit the rotational analysis, the potential curves of two excited states were estimated from the Franck-Condon factors and band profile calculations (3)(4)(5).…”

High-resolution spectroscopy with a CCD array detector: application to the 2880 Å emission band system in I2

“…Yet the properties of the high-pressure emission spectra suggested that the lasing transition, now know as D ' -+ A', resulted from a pooling of deposited energy in the D ' state, which could be most easily understood if D ' were the lowest member of its cluster of states, and if this cluster were the lowest of all, correlating ionically with I-+ I+(~P,). My group discussed this problem in 1980 and again in 1983 (8,9). Interestingly, the work that appears to "put the last nail in this coffin" has come again from King's lab (10): He and McLean showed recently that those studies which found states below 40 000 cm-I suffered from photon miscounting, and were actually not 2-photon but 3-photon (1 + 2) excitations, F 0: t B t X and F' 0: + B t X, to ion-pair states correlating with I+('P,) and I+('D), respectively.…”