The "infinity" Rydberg constant is:
The "infinity" constant appears in the formula:
Which gives the Rydberg constant for a certain atom with one electron with the rest mass <math>m</math> and the atomic nucleus mass <math>M</math>. And can be derived from the formula:
As the formula for the Rydberg constant contains no less than five other physical constants, namely the elementary charge <math>e</math>, the electron rest mass <math>m</math>, the permittivity of vacuum <math>\epsilon_0</math>, Planck's constant <math>h</math>, and the speed of light in vacuum <math>c</math>, it is one of the most welldetermined physical constants. Measuring the Rydberg constant namely confirms the proportions of the values of the other five constants.
For more information about this formula, see the article on the Rydberg formula.
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