Le spectre électronique de la molécule As2

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Abstract
Excitation by a high-frequency electromagnetic field of a mixture of neon and arsenic vapor at 380 °C allowed us to observe the already known transitions of the As2 molecule and to find two new systems, c → X and e → X. A rotational analysis has been carried out for several bands of a → X, A → X, B → X, d → X, c → X, and d → c systems, and corresponding rotational constants have been determined. From the results of this analysis, the nature of different excited states has been specified and it was shown that they belong to Hund's case c: the c state is formed by 0u− and 1u components of a 3Σu+ state; the a state is the 0u+ component of a 3Σu− state and the d (1 g) state seems to be in correlation with a 3Πg state: A and B states are 1Σu+states. Assumptions have been made as to the electronic configurations to which these states are ascribed, and to the dissociation products.

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