Emission Spectrum of the PO Molecule. Part IV. Spectrum in the Region 7000–12 000 Å

Abstract

A new transition, A2Σ+–B2Σ+, of the PO molecule has been observed in the region 7000–12 000 Å. From the rotational analysis of the bands numerous perturbations have been observed in the ν = 0–5 levels of the A2Σ+ state. These perturbations have been shown successfully to be partly due to the B′2Π1 state and partly due to a new 4Σ− state. A shift has been detected in the A2Σ+, ν = 3, 4, and 5 levels, which has been attributed to a vibrational perturbation produced by the F2Σ+ state. A new G2Σ+–A2Σ+ transition also is reported.

Multireference configuration interaction study on spectroscopic parameters and molecular constants of PO and PO+

“…The PO and PO + have been investigated extensively in experiment3–38. Further related references are given in many of the references cited here.…”

“…Henceforth, the PO radical became the subject of considerable work, and the spectroscopic properties were widely studied by emission and absorption spectroscopy, laser photoelectron spectroscopy, infrared (IR) spectra, and so on. In the 1960s and 1970s, much progress was achieved by Verma et al12–21 and Coquart et al22–28. Their studies led to the discovery of 22 electronic states and a considerable number of transition bands were observed amongst these states.…”

Configuration interaction calculations of miscellaneous properties of the X2Pirground state, the C´2Delta excited state and related C´2Delta-X2Pirtransition bands of PO: I. X2Pirground state

“…Certain states, e.g. the 4 − state (Verma and Jois 1973), have only been discovered via a perturbation on other states. Through a comparison with the (in the valence shell isoelectronic) NO molecule, the symmetry species 2 , 2 and 2 have been observed, as expected .…”