🔬 Discovery

Procopiu–Bohr magneton

Magnetón de Procopiu-Bohr

Date
1911-1913 · confidence medium
Place
Iași, Romania
Credited to
Ștefan Procopiu; independently obtained by Niels Bohr in 1913
Field
Cosmos & Earth

⚠️ Disputed: the sources disagree.

What was discovered

Romanian physicist Ștefan Procopiu obtained the electron's natural unit of magnetic moment before Niels Bohr reached the same value, in the summer of 1913, as a consequence of his atomic model; Wolfgang Pauli formalized the name "Bohr magneton" in 1920.

In the Romanian literature the unit is sometimes called the "Bohr–Procopiu magneton" in recognition of Procopiu's priority; elsewhere it is known simply as the Bohr magneton.

What it led to

  • Standard unit of magnetic moment in atomic and particle physics
  • Study of quantum magnetism and the Zeeman effect

Links

Sources✓ verified 2026-09-28