Spectre d'émission de la molécule PO : Etude des états ²Σ⁺ situés dans le domaine énergétique 50 000–58 000 cm⁻¹ des molécules P¹⁶O et P¹⁸O

Abstract

The rotational analysis of bands of P 16 O and P 18 O molecules has been carried out by emission experiments. These bands, all perturbed, correspond to transitions from A 2 Σ + , F 2 Σ + , G 2 Σ + , H 2 Σ + and I 2 Σ + to B 2 Σ + , A 2 Σ + and X 2 Π states in the respective regions 3850–5300, 6500–7000, and 1800–2000 Å. The results of first- and second-order deperturbations for the observed interactions give the values of the constants of the F, G, H, and I states with a better accuracy than that obtained previously by Verma et al. Particularly, they infirm the hypothesis of a predissociation of some vibrational levels by the repulsive A′ 2 Σ + state and permit the assignment of a new quantum specification to the H 2 Σ + state. The electronic structure and the order in energy of the Rydberg states considered are then consistent to those which have been proposed by Ackermann et al.