Rotational analysis of the 0-9, 0-10 and 0-11 bands of the A²Π_u-X²Π_g band system of (¹⁶O¹⁸O)⁺

Abstract

High-resolution spectra of the 0-9, 0-10 and 0-11 bands of the A²Π_u-X²Π_g system of (¹⁶O¹⁸O)⁺ ion have been studied for their rotational structure. This study enables a direct determination of the Λ-doubling parameters of the A ²Π_u and X ²Π_g states. The model of 'pure precession' explains, though not entirely, the Λ-doubling of the X²Π_a state as arising out of its interaction with the B² ∑_g^- state. The Λ-doubling in the A²Π_u state was found insignificant.