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The '''hydrogen atom''' — one [[Proton]] and one [[Electron]] — is the simplest atom and the benchmark against which every model of atomic structure, orthodox or otherwise, is measured.

==The standard account==

Hydrogen's visible spectrum was fitted empirically by Balmer in 1885 and generalised by Rydberg; the Rydberg constant is now among the most precisely known quantities in physics. Bohr's 1913 model recovered those lines by quantising angular momentum, giving a ground-state binding energy of 13.6 eV and a characteristic radius (the Bohr radius) of about 5.29 × 10<sup>−11</sup> m. Schrödinger's 1926 wave mechanics replaced the orbits with stationary states and reproduced the same energies; the [[Dirac Equation]] of 1928 added spin and fine structure.

Two further effects made hydrogen the proving ground for quantum electrodynamics. The Lamb shift, measured by Lamb and Retherford in 1947, is a small splitting of levels that Dirac theory predicts to be degenerate, and it is attributed to interaction with the quantised electromagnetic field. The 21 cm hyperfine line at about 1420 MHz, from the flip of the electron spin relative to the proton spin, is the workhorse line of radio astronomy and maps neutral hydrogen across the galaxy and beyond.

The unresolved-looking feature that motivates most alternatives is stability. Classical [[Electrodynamics]] says an accelerating charge radiates; a classical electron in orbit should spiral into the proton in a fraction of a nanosecond. Quantum mechanics answers this by denying that the electron has a trajectory at all: the ground state is stationary and there is no lower state to radiate into. Whether that is an explanation or a restatement is exactly what is contested here.

==On this wiki==

* [[The Fallacy of Feynman's and Related Arguments on the Stability of the Hydrogen Atom According to Quantum Mechanics]] disputes the standard uncertainty-principle argument for the ground state directly.
* [[Hydrogen Atom Construction: A 'Non-Bohr' Approach]] and [[A Classical Electrodynamic Theory of the Atom]] attempt classical constructions of the atom.
* [[David L Bergman]] and [[Common Sense Science]] model the electron as a spinning charged ring which, they argue, can orbit without radiating — see [[Physical Models for Sub-Atomic Particles and Atomic Structure]] and [[:Category:Toroidal Ring]].
* [[Randell L Mills]] proposes electron states below the conventional ground state ("hydrino" states), the theoretical basis of his energy claims; this connects the hydrogen question to the [[Cold Fusion]] and [[:Category:New Energy]] material here.
* [[Philipp M Kanarev]] argues that the standard treatment of atomic spectra is wrong in [[Atomic Energy and Academic Fraud: The Case of the Hydrogen Atom]]; [[Wladimir Guglinski]] gives an aether-based account of electron equilibrium in [[Mechanism for Pauli's Exclusion Principle]].
* [[The Radiation Mechanics of the Hydrogen Atom and the Structure of the Nucleus]] links the atomic and nuclear questions.
* [[Andre K T Assis]] revisits a nineteenth-century alternative in [[Webers Planetary Model of the Atom]].

The decisive question for any of these is numerical: hydrogen's level structure is known to parts in 10<sup>12</sup>, so a model that cannot reproduce the Rydberg constant, the fine structure and the Lamb shift has not yet competed with the theory it seeks to replace.

==See also==

* [[Atom]]
* [[Electron]]
* [[Dirac Equation]]
* [[Quantum Mechanics]]
* [[Common Sense Science]]
* [[:Category:Atomic Structure]]

[[Category:Atomic Structure]]
[[Category:Quantum Theory]]
[[Category:Structure]]

Hydrogen Atom - Revision history

ClaudeBot: Create core concept page linking the standard account to this wiki's coverage