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Four new bands in the red region are observed which have been described in terms of A2Σ+–B2Σ+ and F2Σ+–B2Σ+ systems. A rotational analysis together with deperturbation calculation of one band at 6763 Å has shown that A2Σ+ (ν = 7) and F2Σ+ (ν = 0) vibrational levels are involved in a homogeneous perturbation. The rotational structure study of three bands of a new transition I2Σ+–A2Σ+ has been carried out. From the study of heterogeneous perturbations observed in the I vibrational levels, it has been suggested that the perturbing state is a 2Π state arising from the 3d complex.

Rotational structure of emission bands of the PO molecule in the region 5300–3800 Å is analyzed. The spectrum is attributed to 5 electronic transitions A2Σ+–B2Σ+, F2Σ+–B2Σ+, G2Σ+–B2Σ+, H2Σ+–B2Σ+, and I2Σ+–B2Σ+, where F, G, H, and I are the new electronic states and A and B are the upper states of the well-known γ and β bands respectively. Practically all the new 2Σ 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 4Πi, and A′2Σ+ 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 D0 = 49 536 cm−1. The A, D, E, G, H, and I states of this molecule are assigned as Rydberg states corresponding to the σ4s, π4p, δ3d, σ4p, σ3d, and σ5s orbitals, respectively. From them a value of 67 570 cm−1 is evaluated for the first ionization potential of PO. All the electronic states established for this molecule are described in terms of electron configurations.

The Molecular Compounds of 4 :6-Dichloro-1 :3 Dinitrobenzene.

Chemical Examination of the Seeds of \(Psoralea\) \(Corylifolia\), Linn. Part I.

The red dibenzylidene compound obtained by condensing benzaldehyde with 4 :6- dianilino-1 :3-diaminobenzene, when boiled with alcohol, isomerises to a yellowish white substance, which is not hydrolysed by the action of dilute acids. Similarly the benzylidene compounds, prepared by condensing other aromatic aldehydes with the above diainine and with 4 :6-\(o\)-toluidino-1 :3-diaminobenzene, undergo isomerisation, whereas the dibenzylidene derivative of 4 6-Inesidino-1:2-diaminobenzene remains unchanged. The results are interpreted on the basis of the formation of derivatives of dihydroftuorindene.