[Physics] Precision measurements on sodium doublet wavelength


I'm currently searching for a good and reliable source where precision measurements on the wavelength of the so called sodium doublet ($D_1$ and $D_2$ lines) at approximately 589.0 nm and 589.6 nm are made.

Best Answer

Using the NIST Spectral Database, entering sodium (Na) with $\lambda$ between 588nm and 590nm gives wavelengths of 588.9950954nm and 589.5924237nm.

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