摘要
考虑到碰撞展宽导致的洛伦兹线型,理论上研究了佛克脱线型(高斯线型和洛伦兹线型的卷积)HeⅠ1 083.0 nm辐射线的后向散射截面和有效后向散射截面,HeⅠ1083.0 nm辐射线实际上由三条非常接近的1 083.034,1 083.025和1 082.908 nm辐射线组成,文章给出了此3条辐射线的有效后向散射截面的曲线及其峰值,得到的10-16数量级与预言的数量级相一致。此研究比以前假定HeⅠ1 083.0 nm辐射线为高斯线型更接近实际,从而为共振雷达探测热成层亚稳态He提供了更全面翔实的理论基础。文章还给出了HeⅠ388.9 nm和HeI 318.8 nm辐射线的有效后向散射截面的曲线及其峰值,得到它们的有效后向散射截面比HeI 1 083.0 nm辐射线的小,此结论与实验结果相一致。
In the present paper, considering the Lorentz profile caused by collisions, the backscattering cross-section and the effective backscattering cross-section of Voigt profile （the convolution of Gauss profile and Lorentz profile） of He Ⅰ 1 083.0 nm were studied. The He Ⅰ 1 083.0 nm is actually a triplet formed by three very close lines, the 1 083. 034 nm, the 1 083.025 nm and the 1 082. 908 nm, and the curve and peak value of the backscattering cross-section and the effective backscattering crosssection were given. The order is consistent with the predicted order. This result is closer to the actual case than the Gaussian profile, and gives overall and detailed theoretical basic to resonant Lidar to detect the metastable He in thermosphere. The curves and peak values of the backscattering cross-section and the effective backscattering cross-section of He Ⅰ 388. 9 nm and He Ⅰ 318.8 nm were also given, which are smaller than that of the 1 083.0 nm. This is consistent with the experiment results.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第8期1607-1610,共4页
Spectroscopy and Spectral Analysis
基金
河南科技大学人才科学研究基金项目资助
关键词
佛克脱线型
后向散射截面
共振雷达
Voigt profile
Backscattering cross-section
Resonant Lidar
