Low-lying electronic states of Li2+ and Li2−

Characterization of theX 2 ∑+u state of7Li−2 via negative ion photoelectron spectroscopy

“…This band appears as a single narrow feature in the photoelectron spectrum. Our experimental value for the adiabatic electron affinity of 7Li 2 is in good agreement with several theoretical values [7][8][9][10][11]. Thus, subtracting the A 1Z+ (v' = 0) -+ X aS+ (v" = 0) transition energy for 7Li2, from our measured 7Li2, A1Z,+(v'=O)+e-+--VLi~-, X 222"+ (v" = 0) transition energy (EBE) gives the energy difference between the X 2N+ (v" = 0) state of 7Li 2 and the X ~Ng + (v' =0) state of VLi2, i.e.…”

Asymptotic Methods in Quantum Mechanics

“…This is because the dipole-dipole-quadrupole hyperpolarizability B of these systems is very large and is actually more important than the quadrupole polarizability term from the second order energy. For Lit, the asymptotic theory is compared with the CI calculations of Konowalow and Fish [99] and of Schmit-Mink et al [100]. 9.2, the potential curves obtained from summing the expressions in (9.51), (9.52), and (9.53) are shown [98].…”

A revised study of the Li2+ alkali-dimer using a model potential approach

“…From the theoretical point of view, a restricted Hartree-Fock-Roothaan approach was developed by Henderson et al [11], while Müller et al [12] carrying out calculations with frozen atomic core, generated adiabatic potential energy curves of states dissociating up to the Li + (1s 2 )+Li(3d) limit. In a study by Konowalow et al [13], the first eight lowest-lying electronic states were obtained by valence configuration calculations, whereas Schmidt-Mink et al [14] employed ab-initio self-consistent-field (SCF) and valence CI techniques combined with a core polarization potential for a better description of the inter-shell correlation effects.…”