A full description of the potential curve of the B~I#PI#_u state of ~7Li_2

摘要

An accurate potential curve for the bound and quasibound region of the B I nu state of 7Li2 is produced by analyzing high resolution sub- Doppler B I n u ~ xI I; excitation spectra in conjunction with lower resolution data of Hessel and Vidal [I. Chem.Phys. 70,4439 (1979)] and of Russier et al. [I. Mol. Spectrosc. 168, 39 (1994)]. The bouna'.calldquasibound part of the curve is generated by the direct fit of molecular energies to a numerical potential; the ou~ermost (repulsive) part of the curve is calculated by an asymptotic method using Coulombic and exchange parameters determined from the 1 I ng and A II: states of the lithium dimmer. The full potential energy curve of the B I n u state reproduces all measured energies of f parity, and the widths of the predissociated lines, to within the experimental accuracy.