Rydberg formula (wavelengths) (1/λ = R_H Z² (1/n₁² - 1/n₂²))

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1/λ = R_H Z² (1/n₁² - 1/n₂²)

What each symbol means

SymbolWhat it stands for
R_HRydberg constant ≈ 1.097×10⁷ m⁻¹ (for infinite nuclear mass)
n_1Lower level (final)
n_2Higher level (initial), n₂ > n₁

When to use this

Emission spectrum hydrogenic atom; vacuum wavelength; non-relativistic.