Excitation spectra for the 4pπ [sup 3]Π[sub g]–a [sup 3]Σ[sub u][SUP ARRANGE="STAGGER"]+] system in [sup 20]Ne[sub 2] and [sup 22]Ne[sub 2] have been used to characterize the v=0 through v=3 levels in both electronic states. This is the first time levels with v>...