Gerade Rydberg states of Xe2 lying 12 500-14 800 cm-1 above the a3 Σu+ ( 1u, Ou- ) metastable levels of the dimer have been observed by laser spectroscopy in the afterglow of a Xe microplasma with a volume of ∼160 nL. Photoexcitation of Ωg ← a3 Σu+ ( 1u, Ou- ) (Rydberg ← Rydberg) state transitions at small internuclear separations ( R ≃ Re ( Xe2+ ) ) while monitoring the suppression of Xe2 ( Ou+ → Og+ ) spontaneous emission in the ultraviolet confirms the presence of an extensive series of red-degraded vibrational bands in the 675-800 nm region that are tentatively identified with an Ω = 1 upper state with a molecular ion core having predominantly B2Π3/2g character. Spectral simulations yield the following constants for the 1g state: Re′ = 3.49 ± 0.1 Å, Te = 12 980 ± 70 cm-1, ωe′ = 122 ± 3 cm-1, ωe′ xe′ = 0.9 ± 0.2 cm-1, and De′ = 2250 ± 70 cm-1.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry