The A¹Π-X¹Σ band system of CD⁺. Spectroscopic constants and isotope shifts

Abstract

Six bands of the A1Π-X1Σ system of CD+ in the region 3800-4800 Å have been recorded in emission using an aluminum hollow-cathode discharge in the HeC2H2 mixture. From the vibrational and rotational analysis of the observed bands, the following constants (cm-1) are obtained: {A table is presented}ΔG 1 2; (ωe), (ωexe) are calculated from isotope relation. The electronic isotope shift Δρei = Te(CH+) - Te(CD+) = -13 cm-1 has been derived according to the theoretical expression given by Bunker. A somewhat smaller value was obtained from the pure electronic energy difference using "experimental" values of the zero point energies. © 1979.