Infrared (0.9–1.65 μm) emission from thallium iodide photoexcited with ultraviolet excimer laser radiation

Abstract

Interaction of vacuum ultraviolet excimer laser radiation with fused silica. I. Positive ion emissionThe infrared emission spectra from 0.9 to 1.651lm produced when thallium iodide vapor is photodissociated by excimer laser wavelengths of 193,248,308, and 351 nm are reported. In this spectral region, only atomic thallium transitions were observed. No emission from metastable atomic iodine at 1.3151lm (5 2 PI12 -+ 5 2 P 312 ) or thallium at 1.2831lm (6 2P3/2 -+6 2P1/ 2 ) was ever detected in contrast to strong 1.3151lm signals obtained by ultraviolet (UV) excimer laser dissociation of C 3 F71. The failure to detect metastable atomic emission from TIl photodissociation is explained by the fast quenching of the metastable states during superelastic collision with electrons produced by photoionization of the TIL Consequently, a pulsed iodine 1.3151lm laser based on photodissociation of thallium iodide does not seem practical.

Comprehensive ab initio calculation and simulation on the low‐lying electronic states of TlX (X = F, Cl, Br, I, and At)

“…These systems have long been interesting to both experimentalists and theoreticians. Numerous spectroscopic measurements have been carried out hitherto for TlX (X = F, Cl, Br, and I) 2–33. However, the geometrical and spectroscopic properties of most excited states have not as yet been determined.…”