Abstract
The emission spectrum of Cl 2 in inert buffer gases is dominated by a band system with peak intensity near 2580 Å. This transition is identified as the D′(2 g 3 P 2) → A′(2 u 3Π) system, where the parenthetical entry for the upper state indicates its ion-pair parentage, and the lower state is the lowest excited valence state. A rotational analysis which includes a total of 1300 assigned lines for 7 v′- v″ bands in 35Cl 2 and 10 in 37Cl 2 yields the following spectroscopic constants for 35Cl 2 (units cm −1 and Å): Δ T e = 40 126.7(6), ω′ e = 252.43(1), ω″ e = 258.5(5), B′ e = 0.11671(2), B″ e = 0.16311(8), R′ e = 2.8742(2), and R″ e = 2.4313(6). The absolute nergies of both states remain uncertain but are estimated from other work to be T″ e = 57 300(20) and T″ e = 17 170(20) cm −1.
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