Atomic physics although they could be described and classified by their properties (in bulk). The invention of the periodic system of elements by Mendeleev was another great step forward. The true beginning of atomic physics is marked by the discovery of spectral lines and attempts to describe the phenomenon, most notably by Joseph von Fraunhofer. The study of these lines led to the Bohr atom model and to the birth of quantum mechanics. In seeking to explain atomic spectra an entirely new mathematical model of matter was revealed. As far as atoms and their electron shells were concerned, not only did this
Ugo Fano Fano spent 1936–37 with Werner Heisenberg in Leipzig. In 1939, he married Camilla Lattes, also known as "Lilla", a teacher who would collaborate with him in a well-known book on atomic and molecular physics, "Physics of Atoms and Molecules" (1959). Appendix III of this book presents an elementary description of the collision of two charged particles, which was used by Richard Feynman in lectures that have been published as "". An expanded version of this book was subsequently published as "Basic Physics of Atoms and Molecules" (1972). Later that year, he immigrated to the United States due to increasing antisemitic