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I am working with the redshift phenomena and analyzing the spectral lines of various emissions by galaxies. However, when I came to analyze the change in wavelength I was confused on what to compare to in terms of rest emitted wavelength. I found various values for the same ionized atom that varied tremendously. I am wondering if there were accepted values for the wavelength emitted by the atoms?

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marked as duplicate by Emilio Pisanty, Thomas Fritsch, Rob Jeffries, stafusa, John Rennie Jun 24 at 8:02

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    $\begingroup$ have you checked NIST spectra database? $\endgroup$ – wcc Jun 22 at 23:35
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My go-to resource is the NIST Atomic Spectra Database.

Doubtless there are other resources for specific applications, in which case you'll have to ask the people who actually work on those applications.

A related question, What are good, reliable databases of atomic spectra?, asks for alternatives.

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