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 P16O and P18O molecules has been carried out by emission experiments. These bands, all perturbed, correspond to transitions from A2Σ+, F2Σ+, G2Σ+, H2Σ+ and I2Σ+ to B2Σ+, A2Σ+ and X2Π 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′2Σ+ state and permit the assignment of a new quantum specification to the H2Σ+ 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.