E.A. Shenyavskaya

ELECTRONIC STATES OF SCANDIUM MONOIODIDE

The many electronic transitions observed in high-resolution spectra of the fluorescence of scandium monoiodide following excitation by Ar+ and Kr+ laser lines have been extensively analyzed. Equilibrium vibrational and rotational constants are obtained for the six lowest electronic states. Spin-orbit constants in a3Delta and b3Pi are also determined. The laser-excited levels are regrouped into two electronic states, of 1Pi and 3Pi symmetries, for which molecular constants are derived. Copyright 1997 Academic Press. Copyright 1997Academic Press

Spin–orbit interaction between c 3Σ+ and B 1Π states of ScF: Effects on the fine and hyperfine structures

The introduction of an off‐diagonal spin–orbit interaction element in the Hamiltonian matrix representing the close‐lying B 1Π and c 3Σ+ states of ScF allows us to interpret the anomalies previously observed, i.e., the large Λ‐type doubling in B 1Π and the large spin‐splitting in c 3Σ+ at v=0, both of which decrease rapidly with increasing vibration. Deperturbed molecular constants for the v=0,1,2 levels in both states, together with values of the interaction parameter, are obtained from the numerical treatment of the wave numbers of 1454 lines in the B 1Π→X 1Σ+(0‐1), (1‐1), (2‐0), (2‐2), and c 3Σ+→X 1Σ+(0‐1), (1‐0), (2‐0) bands. The interaction between B 1Π and c 3Σ+ is greatest at v=0 and decreases rapidly with increasing v. The model of the states including hyperfine effects is then used to interpret the observed hyperfine structure which is attributed to strong interaction between the 4sσ3dσ electrons and the 45Sc nucleus of spin 7/2. The hyperfine structure of the rotational levels in B 1Π(v=0,1,2) a...