The Ångstrom (B¹Sigma⁺- A¹Pi) system of the CO molecules: new observations and analyses

Abstract

In the emission spectrum of the CO molecule four bands: 1-2, 1-7, 1-8, 0-6 which have not been observed so far and the 1-5 band belonging to the Ångstrom system (B 1Sigma+ - A 1Pi) have been found and photographed by conventional spectroscopy. The rotational analysis of bands made it possible to extend and to improve the information for both combining states. Especially the spectroscopic and quantum-mechanical constants of the B 1Sigma+ Rydberg state around its v=0 and 1 levels were more precise and more extended. A new quantitative classification of the relative band intensities for the currently extended Angstrom system bands has also been proposed.

Reanalysis of the Ångström System (B1Σ+- A1Π) in the13C16O Isotopic Molecule

“…For the 12 C 16 O ordinary molecule many perturbations of the A 1 Π state have been reported [11,3538]. A systematic classication of the A 1 Π state perturbation observed up to 1966 year was carried out by Krupenie [39] and completed by Simmons et al [37].…”

“…and for the lower A 1 Π state (having the knowledge from the previous works [11,15,19] that Λ-doubling in this state is negligibly small for unperturbed levels):…”

Fourier-transform spectroscopy of 13C17O and deperturbation analysis of the A1Π (υ=0–3) levels

“…A systematic classification of the perturbations occurring in the A 1 Π state of the main 12 C 16 O isotopologue was conducted by Krupenie [37] and Simmons et al [38]. A considerable contribution to the identification and classification of the A 1 Π state perturbations has been made by Kępa and Rytel in a number of investigations over the years [39][40][41]. A comprehensive analysis and deperturbation calculations were conducted by Field et al [42,43].…”

Temporal Variations of Optical Emission Spectra in Microwave-Excited Plasma in Saturated Water Vapor under Reduced Pressure during Photoresist Removal

“…Emission spectra of CO (third positive system, b 3 Σ -a 3 Π) [1,2,[32][33][34][35] and another CO (Ångström system, B 1 Σ -A 1 Π) [1,2,[32][33][34][35][36][37][38][39][40] are presented respectively in Tables 1(a) and 1(b) [35]. These spectra are readily apparent.…”