A full description of the potential curve of the B [sup 1]Π[sub u] state of [sup 7]Li[sub 2].

An accurate potential curve for the bound and quasibound region of the B [sup 1]Π[sub u] state of [sup 7]Li[sub 2] is produced by analyzing high resolution sub-Doppler B [sup 1]Π[sub u]←X [sup 1]Σ[sub g][sup +] excitation spectra in conjunction with lower resolution data of Hessel and Vidal [J. Chem. Phys. 70, 4439 (1979)] and of Russier et al. [J. Mol. Spectrosc. 168, 39 (1994)]. The bound and quasibound part of the curve is generated by the direct fit of molecular energies to a numerical potential; the outermost (repulsive) part of the curve is calculated by an asymptotic method using Coulombic and exchange parameters determined from the 1 [sup 1]Π[sub g] and A [sup 1]Σ[sub u][sup +] states of the lithium dimer. The full potential energy curve of the B [sup 1]Π[sub u] state reproduces all measured energies of f parity, and the widths of the predissociated lines, to within the experimental accuracy. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]