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Published online by Cambridge University Press: 05 June 2012
1897 Discovery of electron
1900 α, β and γ radioactivity
1905 Photon identified as quantum of electromagnetic field
1911 Discovery of atomic nucleus
1912 Discovery of cosmic rays
Invention of cloud chamber
1913 Bohr model of atom
1919 Discovery of proton
1923 de Broglie wave–particle duality
1925 Introduction of electron spin
1926 Wave mechanics
1927 Uncertainty Principle
1928 Dirac wave equation
1930 Neutrino hypothesis
1931 Operation of first cyclotron and of Van der Graaff accelerator
1932 Discovery of positron
Discovery of neutron
1933 Discovery of electromagnetic showers
1934 Theory of beta decay
Discovery of Čerenkov effect
1935 Yukawa theory of nuclear forces
1936 Breit–Wigner resonance formula
1937 First evidence for mesotron (= muon)
1939 Observation of mesotron (= muon) decay
1940 Spin-statistics theorem
1945 Phase stability in accelerators (synchrotron principle)
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