Electronic spectra of metal ion – rare gas pairs: High resolution analysis of the A2Πr–X2Σ+ system of BeKr+

Abstract

The A2Πr–X2Σ+ system of Be84Kr+ has been studied at high resolution in the region 3950–4265 Å. Rotational analyses have been performed for the 0–1, 0–0, 1–0, and 2–0 bands, and molecular constants have been determined by least squares fits of the line frequencies to model Hamiltonians. The regular nature of the excited state has been confirmed, despite the opposite signs found for the Λ-doubling constants, p and q. Comparisons of the Λ-doubling constants for the A2Πr state and of the spin-splitting constant (γ) for the X2Σ+ state have been made with those for other nine valence-electron diatomics. Although a systematic study of isotope effects due to the several isotopes of naturally-occurring krypton has not been possible, at least one branch of the 1–0 band of Be86Kr+ has been identified unequivocally.