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- W2000481545 abstract "The first atmospheric profiles of the ultraviolet/visible (UV/vis) absorption bands of the collision complex O 2 ‐O 2 , or O 4 in brief, are reported. The O 4 absorption profiles are inferred from direct Sun spectra observed from the LPMA/DOAS (Laboratoire Physique Moléculaire et Application/Differential Optical Absorption Spectroscopy) balloon gondola. Seven O 4 absorption bands ‐ centered at ∼360.7, 380.2, 446.7, 477.1, 532.2, 577.2, and 630.0 nm ‐ are investigated for atmospheric pressures ( p ) ranging from ∼500 hPa to ∼40 hPa and temperatures ( T ) ranging from 203 K to 250 K. For the encountered atmospheric conditions, it is found that, (a) the band shapes do not change with T and p and (b) the peak collision pair absorption intensities (α i ) concurrently increase with decreasing T (by about 11 % over a Δ T =50 K). That result is in agreement with previous laboratory O 4 studies mostly conducted at high O 2 partial pressures (up to several hundred bars). Furthermore, by reasonably assuming that the O 4 absorption cross sections are T‐independent, the inferred T‐dependence of α i ( T ) suggests a thermally averaged enthalpy change < Δ H > = −(1207±83) J/Mol involved in the formation of O 4 . Our inferred Δ H is in reasonable agreement with the orientation and spin averaged O 4 well depth De(O 4 ) (= ‐(1130±80) J/Mol) measured in a recent O 2 ‐O 2 collision experiment, when accounting for the rovibrational energy change during O 4 formation (186 J/Mol)." @default.
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- W2000481545 date "2001-12-15" @default.
- W2000481545 modified "2023-09-27" @default.
- W2000481545 title "First atmospheric profile measurements of UV/visible O<sub>4</sub>absorption band intensities: Implications for the spectroscopy, and the formation enthalpy of the O<sub>2</sub>-O<sub>2</sub>dimer" @default.
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- W2000481545 doi "https://doi.org/10.1029/2001gl013734" @default.
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