James Rufus

High‐resolution photoabsorption cross‐section measurements of SO2 at 160 K between 199 and 220 nm

Photoabsorption cross sections of sulfur dioxide over a range of temperatures are required to interpret observations and to support models of the atmospheres of Io and Venus. We report high-resolution (lambda/Delta lambda approximate to 450,000) photoabsorption cross-section measurements by Fourier transform spectrometry of SO2 at 160 K in the wavelength region 199 to 220 nm, which encompasses the strongest features in the prominent (C) over tilde (1) B-2 -(X) over tilde (1)A(1) system. Our results are compared with literature values obtained at lower resolutions and with 295 K cross sections recorded earlier with the same instrument.

High-resolution photoabsorption cross-section measurements of SO2 at 198 K from 213 to 325 nm

SO2 plays an important role in the atmospheric chemistry of the Earth, Venus, and Io. This paper presents photoabsorption cross sections of SO2 from 213 to 325 nm at 198 K, encompassing the (C) over tilde B-1(2) - (X) over tilde (1)A(1) and (B) over tilde B-1(1) - (X) over tilde (1)A(1) electronic bands. These measurements are part of a series of measurements over the 160 to 300 K temperature range between 190 and 325 nm. The cross sections have been measured at high resolution (lambda/Delta lambda approximate to 450,000) using Fourier transform spectrometry and are compared to other high-resolution measurements in the literature.

High resolution UV photoabsorption cross sections of SO2 at 198 K, 213 – 325 nm

High resolution measurements of SO2photoabsorption cross-sections at 198K between 213-325nm are presented, together with an outline of planned measurements of spectra of SO2isotopologues with applications in the study of the ancient Earth atmosphere.

Molecular absorption cross-section measurements by FTS in the UV

The determination of atomic or molecular absorption cross-sections from the transmission spectra I(v) = I0e−k(v)1, where K(v) is the absorption coefficient, requires measurements of the intensity of the background continuum i0.