I found atomic spectral data on the hydrogen atom, more specifically the first isotope of the hydrogen atom, protium. Beyond that, the data available on other isotopes of any atom doesn't seem to be eaisily available. Here is a page on protium, http://en.wikipedia.org/wiki/Hydrogen_spectral_series It lists all the various series of spectrum for the hydrogen atom. But what about deuterium? or other isotopes? Protium and Deuterium have different spectral fingerprints. How does one find the series for deuterium? Or go about calculating it?