This is a critical review and compilation of the observed and pre dieted spectroscopic data on the molecule N2 and its ions N2-, N2+, N 22+, and the molecule N 3' Each electronic band system is discussed in detail, and tables of band origins and heads are given. In addition to the gas phase electronic, electron and Raman spectra, there are also examined the spectra of condensed molecular nitrogen as well as the pressure-and field-induced infrared and microwave absorption. Dissociation energy of N2J predissociations, and perturbations arc discussed. Potential energy curves are given, as well as radiative lifetimes, .f-values, and Franck-Condon integrals. Molecular constants are listed for the known electronic states. Electronic structure and theoretical calcull;Ltions are reviewed.

Rotational analyses have been performed for 12 bands of the 1Au–1Ag (π*–n) transition of glyoxal. Approximately 15 000 lines have been assigned, and rotational and vibrational constants obtained by computer methods. The vibrations investigated are ν2′ (CO stretching), ν4′ (C–C stretching), ν5′ and ν5″ (CCO bending), and the torsional levels with ν7 ′ = 1–4 and ν7″ = 1–3. A Coriolis interaction has been found involving the vibrations ν7 (au) and ν12 (bu). Some weak anharmonic interactions have also been identified.

Ten bands of Gaydon's and Herman's singlet systems and eight new bands have been photographed under high resolution and analyzed in detail. Two of the new transitions were shown to be '22-a 'II,, the upper state being in one case identical with Watson's and ICoontz's state g, and one new transition to be ' Ao-w ' A, in type. I t is proposed that the new state 'A, has the same electron configuration as the x '2; state. Two bands in the red and one band in the ultraviolet could not be assigned with certainty. Local perturbations in the p' ' Z;state were observed and shown to be caused by the u = 1 level of the b' ' Z: state. Observed pecularities in the rotatior~al structure of most of the upper states are proposed to be indicative of a transition from case b' to d' coupling. In some cases pronounced decreases in branch intensities were observed, indicating predissociations probably caused by "forbidden" intercombination processes. Identification of the electronic strrict~~re of the higher singlet states in terms of Rydberg orbitals is discussed. Rotational and vibrational constants and excitation energies are presented.

Term values and molecular parameters for C H and CH+. I. Botterud, A.

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Seven bands of Kaplan's first system and eleven bands of Kaplan's second system have been photographed under high resolution. The two systems are definitely y III -at l:z and y III -wIA. It is very probable that they are y1llg-alI:z,,-and y lllg-w tAu and that the two lower states belong, along with A ":z,,+ and b'l:Zu+, to the N2 configuration··· 7r u 3 IJ'g27r •• A clear breaking-off of the branches coming from the II+ levels of the ylii. state above v'=O, J'=10 was observed. This is interpreted as an allowed predissociation by a t:z g+ state dissociating to two 2D atoms. Consequently lower limits probably close to the term values for the x, y, w, and a' states could be determined; this locates the a' and w states respectively probably about 2.2 and 2.7 ev above state A, in good agreement with theoretical ex-* Presented in part at the Symposium on Molecular Structure and Spectroscopy, Columbus, Ohio, June, 1955.

The near ultraviolet part of the emission spectrum of nitrogen has been photographed under high resolution. Thirteen bands of the [Formula: see text] system (Lyman–Birge–Hopfield) have been analyzed and new vibrational and rotational constants obtained. Combining the observed data with those obtained by Stoicheff from the Raman spectrum of nitrogen, refined equilibrium constants for the ground state were obtained. The predissociation in the α1Πg state was observed.