Rydberg Constant × hc

The Rydberg constant stated as an energy: 13.6057 eV, the ground-state binding of hydrogen.

Specifications & Metrics

symbol

Ry

status

Measured — CODATA 2022 adjustment

value

13.60569312299 ± 1.5 × 10⁻¹¹ eV

Relative Scale in Constants

Core Principles & Analysis

• The ionization energy of hydrogen to four decimal places.
• Multiplied by hc it converts the spectroscopists' wavenumber constant into electron volts.
• Hydrogen's Lyman-alpha line sits at three quarters of it.