The Rydberg-Ritz combination principle helps explain this process.

The Rydberg-Ritz combination principle of 1908 was also formulated in terms of wavenumbers.

This principle, the Rydberg-Ritz combination principle, is used today in identifying the transition lines of atoms.

He is most famous for his work with Johannes Rydberg on the Rydberg-Ritz combination principle.

The Rydberg-Ritz Combination Principle is the theory proposed by Walter Ritz in 1908 to explain the relationship of the spectral lines for all atoms.