The Ångström (B1Σ+ - A1Π) 0 – 1 and 1 – 1 bands in isotopic CO molecules: further investigations.

Abstract

In the emission spectrum of six 12C16O, 13C16O, 12C18O, 14C 16O, 13C18O and 14C18O isotopologues of the carbon monoxide molecule, new recordings and analyses or new reanalyses of the selected and strongest bands belonging to the Ångström (B1Σ+ - A1Π) system were carried out. Under high resolution, emission spectra of the 0-1 and 1-1 bands were recorded and reanalysed, representing both the 0 - v″ and 1 - v″ progressions of this system. Unobserved so far, new spectral lines were identified, and for the 12C16O, 13C 16O, 12C18O, 14C16O and 14C18O molecules new parameters of the rovibronic structure B0, B1, D0 and D1 of the v = 0 and v = 1 levels of the B 1Σ+ state and band origins ν0 of the 0-1 and 1-1 bands of the B - A transition were determined. A detailed analysis included the predissociation regions of the spectra observed in all analysed bands and isotopologues. The values of rotational quantum numbers and rovibronic terms of the highest nonpredissociated Jh as well as the first, already predissociated Jf levels were determined. On that basis, a new and more precise value of dissociation energy of the CO molecule was determined: cm-1. Also, atomic states of the dissociation products of this molecule, which correspond to this energy, were identified as C(3P0) + O(3P2) i.e. as both triplet ground atomic sublevels. © 2014 IOP Publishing Ltd.