Infrared emission spectroscopy of glow discharge formed in low pressure atmospheric gases

Repulsive double many-body expansion potential energy surface for the reactions N(4S)+ H2⇌ NH(X3Σ–)+ H from accurate ab initio calculations

A single-sheeted DMBE potential energy surface is reported for the reactions N(4S)+H2<-->NH(X3Sigma-)+H based on a fit to accurate multireference configuration interaction energies. These have been calculated using the aug-cc-pVQZ basis set of Dunning and the full valence complete active space wave function as reference, being semi-empirically corrected by scaling the two-body and three-body dynamical correlation energies. The topographical features of the novel global potential energy surface are examined in detail, including a conical intersection involving the two first 4A'' potential energy surfaces which has been transformed into an avoided crossing in the present single-sheeted representation.

Observation of an infrared band sequence in molecular oxygen at 0.1 Torr

The 1-5-microm emission spectrum from the negative glow of a pulsed oxygen discharge at 0.1 Torr has been examined with a Fourier spectrometer in the time-resolved mode. In addition to well-known atomic lines, our spectrum contains nine regularly spaced linelike features around 4000 cm(-1). We interpreted these features as molecular Rydberg-Rydberg transitions of the type DeltaLambda = 1 and Deltaupsilonv = 0. Additional features at 7000 cm(-1) are assigned to the f(1)Sigma(u)(<i/>+) -d(1)II(g) transition in oxygen, resulting in greatly improved spectroscopic constants for the d state.