Spectroscopic modeling of the CO2+A2Πu→ X2Πg (110-010) Renner-Teller bands in electron beam fluorescence of carbon dioxide

Abstract

Improvements have been made to a spectroscopic model of the electron beam fluorescence (EBF) spectra from the CO 2 + A 2 Π u→ X 2 Π g electronic transition of the (100-000), (200-100) and (300-200) bands through the inclusion of the (110-010) Renner-Teller bands. The (010) vibrational state of the CO 2 molecule is thermally excited at temperatures near 300 K based on an analysis of the vibrational partition function for this molecule. The excitation and emission processes for these Renner-Teller bands were modeled with dipole moments. The inclusion of these Renner-Teller bands into the spectroscopic model produces an improved fit to the measured fluorescence spectrum between 337 nm and 339 nm. This improved model provides for a more accurate measurement of the rotational temperature using the EBF technique.