Abstract
Time-resolved atomic absorption spectrophotometry and flash spectroscopy in the vacuum ultra-violet have been employed to investigate primary and secondary processes in the photolysis (λ > 200 nm) of GeH 3I. The initial yield of I(5 2P 1 2 ) and I(5 2P 3 2 ) atoms has been measured ([I(5 2P 1 2 ] 0/ [I(5 2P 3 2 )] 0 ≅ 1.3) and the subsequent reactions of these two states to yield HI have been investigated. Formation of HI by reaction of I(5 2P 3 2 ) atoms with GeH 3I implies a limit to the bond dissociation energy D(H-GeH 2I) ⪅298 kJ/mol. The rate constant for removal of I(5 2P 1 2 ) by GeH 3I has been determined as k 2 = (6.9 ± 1.0) X 10 −12 cm 3 molecule −1 s −1: failure to observe laser emission at 1.315 μm, in this work, is ascribed to the large value for k 2.
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