prezentáció - MTA SzFKI

■ ‘Nadelstrahlung’ concept contradicts Selényi’s experimental results
■ Standing light waves [ H. Hertz, 1888; O. Wiener, 1890; G. Lippmann, 1891;
Nobel prize 1908 for ‘colour photography’]
■ Reciprocal, wide–angle interference [P. Selényi, 1911]
■ Needle radiation [ J. J. Thomson, 1903 ] ‘Nadelstrahlung’
■ Light quanta [A. Einstein, 1905, 1909, 1916 ]: ‘Heuristic viewpoint’ Point–like hν;
photoeffect. Assumption of recoil momentum hν / c in elementary radiation act;
black-body spectrum; thermal equilibrium
■ Recoil, unidirectionality. ‘light darts’: the electromagnetic momentum of a
quantum is in the same direction for all of its energy. G. Breit, P. Jordan [1923]
prove that “unnecessary to assume the unidirectional nature of quanta”
■ G. P. Thomson’s experiments on ‘cutting the light darts’: negative result
A. H. Compton [1923] “Thus even from the quantum viewpoint electromagnetic
radiation is seen to consist of waves.”
■ Assumption of ‘one–sidedness’ of elementary radiation act contradict measured
wide–angle interference [ Pascual Jordan (1928): “Die Krise der Lichttheorie”.
P. Selényi (1911), E.Schrödinger (1920), W. Gerlach & A. Landé (1926) ]
■ W. Kossel [1935] with x-rays discovers analogon of Selényi’s result
■ Needle radiation vs QED [P. A. M. Dirac, P. Jordan, J. C. Slater, 1927]