High‐temperature, high‐resolution cross sections of O₂ in the 83.4 nm region

High‐temperature, high‐resolution photoabsorption cross sections of O2 in the 108.5‐nm region

“…High-resohltion, high-temperature cross-section measurements of 0 2 and N2 at other intense solar lines are currently in progress in our laboratory and will be the subject of flittire publications. In contrast to the heavily predissociated case of 02, our preliminary restilts for N 2 in the 83.4-and 91.6-m regions [Wu and Judge, 1994;Wu et al, 1998Wu et al, , 1997 show quite dramatic effects as a filnction of both temperattire and resolution, as expected, since the N 2 absorption spectrum is known to be characterized by well-…”

“…We have recently implemented a program [Wu a•wl Judge, 1994; Wu et al, 2000Wu et al, , 1998Wu et al, , 1997] to systematically measure the temperature-dependent, ultrahigh-resolution photoabsorption cross sections of N 2 and 02 in the extreme ultraviolet (EUV) region since the data may have important atmospheric modeling implications. In the present work we report the cross sections of O2 in the 108.0-to 108.7-nm region measured with a resolution of 0.0008 nm at 295 and 535 K.…”

“…As a restlit, the maximtim cohmm density permissible in the high-temperature absorption cell is limited to 4 x 10 • molecules/cm 2. The calibration of cobira density and the absolute wavelength scale have been discussed in our previous work [Wu et al, 2000]. A spectral study of 02 in this region with a resoh•tion of 0.002 nm [Tanaka, 1952] is also incorporated in the wavelength calibration.…”

“…The experimental arrangement employed in the present work has previously been described in detail [Wu et al, 2000]. Here we briefly discuss only the important f•atures.…”

Measurements of High-, Room-, and Low-Temperature Photoabsorption Cross Sections of SO2 in the 2080- to 2950-Å Region, with Application to Io

“…We have an operational windowless high-temperature absorption cell (Wu et al 1998) capable of achieving 1000 K, which will be utilized to measure SO 2 cross-sectional data at temperatures higher than 400 K, the limit of the present work. We also plan to extend the SO 2 cross-sectional measurements throughout the 1060-to 3500-Å region.…”