Impact Broadening of Microwave Spectra
Impact Broadening of Microwave Spectra
复制标题
微波光谱的影响拓宽
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
A. Ben
中科院分区：
文献类型：
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作者：
A. Ben
基于Baranger， Kolb and Griem和Fano的理论，在冲击近似中统一处理了气体谐振和非谐振微波谱中的压力增宽，以及随压力增加从谐振形状到非谐振形状的转变。非共振吸收中的弛豫率（德拜弛豫）用碰撞截面表示；与德拜形状的小偏差与松弛矩阵的第二矩有关，并举例说明C${mathm {H}}_{3}$Cl。推导了共振线形状随频率和压力变化的新公式，该公式考虑了共振线上下能级间碰撞引起的特殊效应；该公式再现了N${mathrm{H}}_{3}$和N${mathrm{D}}_{3}$的反演谱的形状。
Pressure broadening in resonant and in nonresonant microwave spectra of gases, as well as the transition from resonant to nonresonant shape with increasing pressure, are treated in the impact approximation in a unified manner, based on the theories of Baranger, Kolb and Griem, and Fano. The relaxation rate in nonresonant absorption (Debye relaxation) is expressed in terms of collision cross sections; small deviations from a Debye shape are related to a second moment of the relaxation matrix, with illustrative application to C${mathrm{H}}_{3}$Cl. A new formula is derived for the shape of resonance lines, as a function of frequency and pressure, which takes into account the special effect of collision-induced transitions between the upper and the lower levels of the line; this formula reproduces the shape of the inversion spectra of N${mathrm{H}}_{3}$ and of N${mathrm{D}}_{3}$.