Alternative form for the pseudo-Voigt peak shape

Alternative form for the pseudo-Voigt peak shape
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伪 Voigt 峰形的替代形式

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发表时间:
2005
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通讯作者:
J. Végh
J. Végh
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文献类型:
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作者:
J. Végh

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在光谱学的不同领域中,有许多不同的近似方法用于计算沃伊特(Voigt)线形。其中最常用的是伪沃伊特线形。它的主要缺点是,从其参数推断出线的自然宽度和光谱仪的影响非常复杂。此外,不存在用更精确的沃伊特形状近似来替换该线形的简单可能性。本文提出了这种峰形的一种替代形式,它由自然宽度和光谱仪的影响作为参数,并且将这些参数清晰地映射到“高斯/洛伦兹混合比”和“总宽度”等参数上。这种表示形式使计算简单快捷。此外,它允许平滑过渡到更精确的沃伊特近似。
A number of different approximations are in use in different fields of spectroscopy for calculating the Voigt line shape. The most popular among them is the pseudo-Voigt line shape. Its main disadvantage is that it is quite complicated to conclude from its parameters the natural width of the line and the spectrometer contribution. Furthermore there exists no simple possibility to replace the line shape with a more accurate approximation to the Voigt shape. An alternative form for this peak shape is presented, which is parametrized with the natural width and spectrometer contribution and transparently maps these parameters to the parameters “Gauss/Lorentz mixing ratio” and “total width.” This representation keeps the calculation simple and quick. Furthermore it allows a smooth transition to the more accurate Voigt approximations.