High‐resolution photoabsorption cross‐section measurements of SO2 at 295 K between 198 and 220 nm
High‐resolution photoabsorption cross‐section measurements of SO2 at 295 K between 198 and 220 nm
复制标题
295 K 下 198 至 220 nm 之间 SO2 的高分辨率光吸收截面测量
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
G. Cox
中科院分区：
文献类型：
--
作者：
G. Stark;Peter L. Smith;J. Rufus;A. Thorne;J. Pickering;G. Cox
二氧化硫是木卫一和金星大气的重要组成部分。精确的光吸收截面数据在这些行星大气的温度是必要的SO2观测和可靠的光化学模型的解释。作为计划的160-300 K范围内的一系列测量的一部分，SO2在295 K，在198-220 nm波长范围内的光吸收截面，已经从真空紫外傅里叶变换光谱仪记录的非常高的分辨率（分辨能力（λ/Δλ）<$450，000）的吸收光谱确定。这些新的测量结果进行了比较，较早的，较低的分辨率（λ/Δλ <$100，000）的光吸收测量在213 K跨越相同的波长区域，与较低的分辨率（λ/Δλ <$100，000）的测量在295 K在一个更有限的区域，并与最近的多普勒限制激光二极管测量在295 K在一个非常窄的波长区域。
SO2 is an important constituent of the atmospheres of Io and Venus. Accurate photoabsorption cross-section data at the temperatures of these planetary atmospheres are required for the interpretation of SO2 observations and for reliable photochemical models. As part of a planned series of measurements over the 160–300 K range, photoabsorption cross sections of SO2 at 295 K, in the wavelength region 198–220 nm, have been determined from very high resolution (resolving power (λ/Δλ) ≈ 450,000) absorption spectra recorded with a vacuum ultraviolet Fourier transform spectrometer. These new measurements are compared with earlier, lower-resolution (λ/Δλ ≈ 100,000) photoabsorption measurements at 213 K spanning the same wavelength region, with lower-resolution (λ/Δλ ≈ 100,000) measurements at 295 K in a more limited region, and with a recent Doppler-limited laser diode measurement at 295 K over a very narrow wavelength region.