science-softCon uv/vis+ spectra data base, www.uv-spectra.de, (C) science-softCon 2018 Substance: oxygen Other Names: Formula: O2 CAS-No.: 7782-44-7 Study: euv absorption cross sections Authors: C.Y.R. Wu, D.L. Judge, T. Matsui Title: High-Temperature Ultrahigh-Resolution Absorption Cross Section Measurements of O2 in the EUV Region Journal/Source: J. Electron Spectr. Rel. Phenom., 144-147, 123-126, (2005); http://dx.doi.org/10.1016/j.elspec.2005.01.047 Data: table, diagram Energy/Wavelength range: 91.1204 - 91.87.40 nm Resolution: 0.0008 nm Temperature: 295 K; 535 K Temperature dependence: yes Pressure/Concentration: Phase: gas pH: Comments: The high-resolution absorption cross-section measurements of O2 in the extreme ultraviolet region have been carried out using a 0.0008 nm resolution and at temperatures of 295 and 535 K. The photon wavelength regions were selected to coincide with the most prominent EUV solar emission features, namely, the N II 108.5 nm, the N II 91.7 nm, the O I 91.1 nm, the O II 83.4 nm, and the He II 30.4 nm. The absorption features of O2 in the extreme ultraviolet region are known to be quite diffuse, therefore the cross-section values of O2 in this spectral region will not critically depend upon the resolution. As the temperature increases from 295 to 535 K we observed that the cross-section value can increase by as much as 60% and decrease by as much as 35% in the presently selected wavelength regions. Author to whom correspondence should be addressed: (e-mail address):