			15min:

ABSORPTIONS BETWEEN 3000 AND 5500 cm^-1 OF NORMAL AND OXYGEN-18 ENRICHED O₄⁺ AND O₄^- TRAPPED IN SOLID NEON.

MARILYN E. JACOX AND WARREN E. THOMPSON, Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8441.

Very recently, Ricks, Douberly, and Duncan have assigned absorptions in the 3000 to 4300 cm^{- 1} spectral region to combination bands of gas-phase cyc -O₄⁺. Other experiments by Kelley, Robertson, and Johnson identified vibronic bands between 4000 and 5300 cm^{- 1} of gas-phase O₄^- complexed with an argon atom. Absorptions corresponding to these bands have been observed in the present experiments for both cyc -O₄⁺ and O₄^- , as well as for several of their isotopologues trapped at 4.3 K in solid neon. The results will be compared with the gas-phase data, and possible assignments will be considered taking into account the results of isotopic substitution.