The formation of beams of triatomic deuterium D3 and the mixed isotopic molecule D2H was optically observed for the first time when the corresponding ions were neutralized by charge exchange. The molecules were detected via the transitions between the Rydberg states n = 3 and n = 2. An assignment of the D 2 H spectrum is given. The total lifetimes of rotational sublevels of different electronic states with n = 3 of D3 were measured from the radiative decay of molecules along their path behind the charge-exchange region. Agreement with theory is satisfactory.

A rotational analysis of the 0–0, 0–1, and 0–2 bands of the D–B and D′–B systems of PO in the region 5500–6900 Å has been carried out from a spectrum obtained at a resolution higher than that of previous workers (Couet and Guenebaut 1966; Couet et al. 1967). The mutual perturbation between D2Πr and D′2Πr has been confirmed from the rotational analysis of the 0–0 and 0–1 bands of the D–A and D′–X systems in the region 2000–2200 Å. The analysis of the D′–X bands has shown that the previously reported E′ state lying between the D and D′ states is actually part of the D′ state. The constants of the D2Πr, D′ 2Πr, B2Σ+, and X2Π states are evaluated and compared with the constants of earlier workers to remove the inconsistency existing in their values for the B and X states.The isotopic bands corresponding to P18O of the D–B and D′–B systems are obtained, thus showing that the D′ state has an anomalous isotopic shift and that the observed levels of the D and D′ states have the vibrational quantum number ν =.

No abstract

No abstract

Rotational structure of emission bands of the PO molecule in the region 5300-3800 A is analyzed.The spectrum is attributed to 5 electronic transitions A2Z+-B2Z+, F2Z+-B2Z+, G 2 Z + -B 2 Z + , H 2 Z + -B 2 Z + , and I 2 Z + -B 2 Z + , where F, G , H , and I are the new electronic states and A and B are the upper states of the well-known y and B bands respectively. Practically all the new ' Z states are found to be perturbed. A qualitative account of these perturbations together with a deperturbation of certain levels is given. A number of cases of predissociation are also observed. This predissociation is attributed to the presence of 411, and A"Z+ states, which dissociate to the ground state atomic products. From this an upper limit of the dissociation energy of the ground state of PO is determined to be Do = 49 536 cm-'. The A, D, E, G, H , and I states of this molecule are assigned as Rydberg states corresponding to the 04s, n4p, 63d, 04p, 03d, and 05s orbitals, respectively. From them a value of 67 570 cm-' is evaluated for the first ionization potential of PO. All the electronic states established for this molecule are described in terms of electron configurations.La structure de rotation des bandes d'emission de la molCcule PO, dans la region spectrale allant de 5300 a 3800 A a CtC analysee. Le spectre est attribue a 5 transitionselectroniques A2Z+-B2Z+, F 2 Z + -B 2 Z + , G2Z+-B2Z+, H2Z+-B2Z+ and 12Z+-B2Z+, ob F, G , H , et I sont les nouveaux Ctats electroniques, et oh A et B sont les niveaux superieurs des bandes bien connues y et B. Presque tous les nouveaux etats ' 2 apparaissent comme etant perturbes. On donne une explication qualitative de ces perturbations et du fait que certains niveaux ne sont pas perturbes. Un certain nombre de cas de predissociation sont aussi observes. Cette predissociation est attribute a la presence d'etats 411, et A J 2 Z + , lesquels se dissocient en atomes dans I'etat fondamental. Ce qui donne, comme limite superie~~re de l'energie de dissociation de I'etat fondamental de la molecule de PO, Do = 49 536 cm-'. Les etats A, D, E, G , H et I de cette molecule sont identifies cornme etats de Rydberg correspondant aux orbitales 04s, n4p, 63d, 04p, 0 3 d e t 0 5 4 respectivement. De ces orbitales une valeur de 67 570 cm-' est deduite pour le premier potentiel d'ionisation de la molecule de PO. Tous les etats electroniques etablis pour cette molecule sont dtcrits en termes des configurations electroniques.