Rotational Analysis of the 2900A Band of CO2+
Abstract
A rotational analysis of the CO2+ doublet band near λ2896 and λ2882 has been made. The band was photographed in the third order of the 30-foot grating spectrograph at Ryerson Laboratory with a dispersion of 0.22A/mm and a resolving power of 300,000. The structure is explained by a 2Σ+u-->2Πg (case a, inverted) transition, where the 2Πg is the ground state of CO2+. Alternate lines are missing as expected for 2Σ in view of the zero spin of the oxygen nuclei. A number of perturbations are observed, which involve displacements and weakening of the lines. These are probably caused by higher vibrational levels of a 2Πu state which lies about 0.8 volts below the 2Σ+u. The values found for the molecular constants of the lower 2Πg state (B1=0.3795 cm-1, B2=0.3813 cm-1 and the Λ-doubling coefficient p=0.004 cm-1) agree with those found by Mrozowski. For the upper 1Σ+u state, B=0.3784 cm-1 and the spin-doubling coefficient γ=0.019 cm-1. The spin-orbit coupling coefficient A for the 2Πg state is - 159.5 cm-1.
- Publication:
-
Physical Review
- Pub Date:
- October 1941
- DOI:
- 10.1103/PhysRev.60.556
- Bibcode:
- 1941PhRv...60..556B