Doublet Separation, Experiment

双分子分离实验

The experimental procedure involves examining the interference fringes of the light at normal incidence ( angle = 0°) such that constructive interference is produced by one wavelength of the doublet

实验过程涉及在正常入射（角度=0°）条件下考察光的干涉条纹，使得通过双线的一条波长产生 constructive interference。

while the other wavelength is adjusted to a half-integer condition. This can be seen in the interference pattern as a weaker ring half-way between the stronger interference maxima. This corresponds to

而另一个波长被调整为半整数条件。这可以在干涉图样中看到，表现为在较强干涉极大值之间较弱的环。这对应于

Advancing the micrometer until this condition occurs again provides data from which the doublet separation can be calculated.

将微米尺推进直到该条件再次出现，可以获取用于计算双峰间距的数据。

Subraction of the two distances obtained in the doublet experiment gives the following expression:

双缝实验中得到的两个距离相减得到以下表达式：

This expresses the fact that the shorter wavelength has gained an order on the longer wavelength. Combining terms gives

这表达了短波长比长波长多了一个数量级的事实。合并项得

Substituting this back into the top equation gives

将此代入上一公式可得

The relationship for the doublet separation is then

双重态分离的关系式为

Calculation

计算

Index

Interference concepts

Example of sodium doublet

索引干涉概念示例：钠双线

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Doublet Separation, Fabry-Perot

双折射分离，法布里-珀罗

The resolvance of the Fabry-Perot interferometer is sufficient to resolve closely spaced spectral doublets like the sodium doublet and the hydrogen-deuterium doublet.

法布里-珀罗干涉仪的分辨能力足以分辨 closely spaced 的谱双峰，如钠双峰和氢-氘双峰。

The experimental procedure yields a distance of movement of the interferometer mirror which allows the doublet separation to be calculated from the relationship

实验程序得到干涉仪镜片的移动距离，这使得可以通过以下关系计算双合分隔

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The average wavelength of the doublet must be known from other measurements to make use of this relationship.

双重线的平均波长必须通过其他测量来确定，才能利用这一关系。