Decomposition of the photoabsorption continuum underlying the Schumann-Runge bands of 16O2—II. Role of the 1 3Πg state and collision-induced absorption |
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Authors: | B.R. Lewis L. Berzins J.H. Carver S.T. Gibson D.G. McCoy |
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Affiliation: | Research School of Physical Sciences, The Australian National University, Canberra, ACT 2600, Australia;Physics Department, University of Adelaide, Adelaide, SA 5000, Australia |
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Abstract: | Measurements are presented of molecular oxygen photoabsorption cross-sections and pressure coefficients taken at selected minima between rotational lines of the Schumann-Runge band system. Both room-temperature and liquid-nitrogen-temperature results are presented from 1760–1980 Å, and corrections are applied for the effect of the wings of the rotational lines. Absorption into the B3∑?u and A3∑+u+ and is found to be insufficient to account for the total observed cross-section, and it is proposed that transitions to the 13Πg valence state account for the remainder. The pressure dependence of the cross-sections is consistent with collision-induced enhancement of the intensities of the forbidden transitions X3∑?g → A3∑+g and , while the temperature dependence of the pressure coefficients is not consistent with absorption due to stable (O2)2 dimers. |
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