Hydrogen Atom — Energy Levels & Radiative Transitions

E_n = −13.6/n² eV  |  Selection rules: Δℓ = ±1, Δm = 0, ±1  |  λ = 1240/ΔE[eV] nm  |  Click two levels to inspect any transition

Energy Level Diagram (n = 1–6, ℓ sublevels)

Click first level (initial), then second level (final).
Arrows: red solid = allowed emission, slate dashed = allowed absorption, gray dashed = forbidden.

Select two energy levels on the diagram to inspect a transition.
Emission Spectrum (major series)
Lyman (UV, →n=1)
Balmer Hα 656 nm
Balmer Hβ 486 nm
Balmer Hγ 434 nm
Paschen (IR, →n=3)
Forbidden
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