Sodium

Sodium Spectrum

钠谱

The sodium spectrum is dominated by the bright doublet known as the Sodium D-lines at 588.9950 and 589.5924 nanometers. The line at 589.0 has twice the intensity of the line at 589.6 nm.

Taking the range from 400-700nm as the nominal visible range, the strongest visible line other than the D-lines is the line at 568.8205 which has an intensity about 0.7% of that of the strongest line. All other lines are a factor of two or more fainter than that one, so for most practical purposes, all the light from luminous sodium comes from the D-lines.

将400-700纳米作为名义可见光范围，除了D线之外，最强的可见光谱线是568.8205纳米处的线，其强度约为最强线的0.7%。其他所有线都比这一线暗一个数量级或更多，因此在大多数实际应用中，所有来自发光钠的光都来自D线。

The illustration shows the interference pattern formed by the sodium doublet in a Fabry-Perot interferometer.

图示显示了法布里-珀罗干涉仪中钠双线形成的干涉图样。