Temperature dependent absorption cross-sections of O2–O2 collision pairs between 340 and 630 nm and at atmospherically relevant pressure

Abstract

The collisions between two oxygen molecules give rise to O4 absorption in the Earth atmosphere. O4 absorption is relevant to atmospheric transmission and Earth's radiation budget. O4 is further used as a reference gas in Differential Optical Absorption Spectroscopy (DOAS) applications to infer properties of clouds and aerosols. The O4 absorption cross section spectrum of bands centered at 343, 360, 380, 446, 477, 532, 577 and 630 nm is investigated in dry air and oxygen as a function of temperature (203-295 K), and at 820 mbar pressure. We characterize the temperature dependent O4 line shape and provide high precision O4 absorption cross section reference spectra that are suitable for atmospheric O4 measurements. The peak absorption cross-section is found to increase at lower temperatures due to a corresponding narrowing of the spectral band width, while the integrated cross-section remains constant (within <3%, the uncertainty of our measurements). The enthalpy of formation is determined to be ΔH(250) = -0.12 ± 0.12 kJ mol(-1), which is essentially zero, and supports previous assignments of O4 as collision induced absorption (CIA). At 203 K, van der Waals complexes (O(2-dimer)) contribute less than 0.14% to the O4 absorption in air. We conclude that O(2-dimer) is not observable in the Earth atmosphere, and as a consequence the atmospheric O4 distribution is for all practical means and purposes independent of temperature, and can be predicted with an accuracy of better than 10(-3) from knowledge of the oxygen concentration profile.

Tropospheric emissions: Monitoring of pollution (TEMPO)

“…In addition, we will use the latest HITRAN database to account for the temperature and pressure dependence of O 2 and H 2 O in the visible region and use O 2 -O 2 cross sections by Thalman and Volkamer [102] to account for the temperature dependence of O 2 -O 2 absorption. However, the GOME-2 data are not optimized for UV/Vis retrievals as the peak of visible Chappuis bands is split into two channels.…”

Influence of external electric fields on oxygen vacancies at the anatase (101) surface

“…For example, molecular hydrogen dimer was identified 4 in the atmospheres of Jupiter, Saturn, and Titan and in the terrestrial atmosphere, only the oxygen 5,6 and water dimers 7 have been measured. The properties of O 2 -O 2 dimer are of great interest for models of earth's radiation, 5,8,9 ozone 10 budgets and for a more fundamental problem, the nature of intermolecular forces. This dimer has been the subject of detailed crossed molecular beam studies 11,12 and high resolution spectroscopy 13,14 together with accurate ab initio studies.…”

Ship-based MAX-DOAS measurements of tropospheric NO&lt;sub&gt;2&lt;/sub&gt;, SO&lt;sub&gt;2&lt;/sub&gt;, and HCHO distribution along the Yangtze River

“…Several trace gas absorption cross sections (Vandaele et al, 1998;Vandaele et al, 2009;Meller and Moortgat, 2000;Serdyuchenko et al, 2014;Thalman and Volkamer, 2013;Fleischmann et al, 2004), the Ring spectrum, a Frauenhofer 135 reference spectrum and a low order polynomial are included in the DOAS fit. Details of the DOAS fit settings are shown in Table 2.…”