Abstract
The Na2 43Πg state has been studied by continuous-wave (cw) perturbation-facilitated optical–optical double resonance (PFOODR) fluorescence excitation and resolved fluorescence spectroscopy. The absolute vibrational numbering was determined by resolved fluorescence to the a3Σ+u state. The OODR excitation lines of the 43Πg (Kv, N) ← b3Πu (Kvb′, J′) ∼ A1Σ+u (KvA′, J′) ← X1Σ+g (Kv", J") transitions show hyperfine splittings, and the hyperfine coupling scheme of the upper 43Πg levels is case bβS. Although this 43Πg state dissociates to the 3p + 3p atomic limit, it is a Rydberg state at a small internuclear distance, and the hyperfine splitting is caused mainly by the Fermi contact interaction of the ςg3s valence electron with the nuclei. The Fermi contact constant was determined to be bF = 218.3 ± 3.9 MHz.
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